Proszę pilnie potrzebne na jutro dam na !!!

2x + 5 = -15 2x = -15 - 5 2x = -20 l ÷ 2 x = -10 -3x - 15 = 12 -3x = 12 + 15 -3x = 27 l ÷ (-3) x = -9 2 (x + 7) = x + 6 2x + 14 = x + 6 2x - x = 6 - 14 x = -8 2 (x - 3) + 4 = -16 2x - 6 + 4 = -16 2x = -16 + 6 - 4 2x = -14 l ÷ 2 x = -7 x - 4 = 2x + 2 x - 2x = 2 + 4 -1x = 6 l ÷ (-1) x = -6 -y + 7 = 2 (y + 3) + 16 -y + 7 = 2y + 6 + 16 -y - 2y = 6 + 16 - 7 -3y = 15 l ÷ (-3) y = -5 3 (x + 4) - 2 (x + 5) = -2 3x + 12 + 2x - 10 = -2 3x - 2x = -2 + 10 - 12 x = -4 tego nie potrafię zrobić.. 4 + x = -1 -1,5x x + 1,5x = -1 - 4 2,5x = -5 l ÷ 2,5 x = -2 2 (x - 5) = -4 (2 - x) 2x - 10 = -8 +4x 2x - 4x = -8 + 10 -2x = 2 l ÷ (-2) x = -1 -9 (y - 2) - 3y - 8 = 2 (4y + 5) -9y + 18 - 3y - 8 = 8y + 10 -9y - 3y - 8y = 10 + 8 - 18 -20y = 0 l ÷ (-20) y = 0 ---------------- ---------------- 3 (a + 1) = 8a - 12 3a + 3 = 8a - 12 3a - 8a = -12 - 3 -5a = -15 l ÷ (-5) a = 3 ------------------ 4 (x - 11) = -3x - 9 4x - 44 = -3x - 9 4x + 3x = -9 + 44 7x = 35 l ÷ 7 x = 5 ------------------- -5x + 7 = -28 -5x = -28 - 7 -5x = -35 l ÷ (-5) x = 7 -0,7 + 0,2x - 2,1 = 0,3x - 3,6 0,2x - 0,3x = -3,6 + 2,1 + 0,7 -0,1x = -0,8 l ÷ (-0,1) x = 8 ----------------------- 2x - 1 = 5x - 31 2x - 5x = -31 +1 -3x = -30 l ÷ (-3) x = 10 11 - 3 (x - 7) = -1 11 - 3x + 21 = -1 -3x = -1 - 21 - 11 -3x = -33 l ÷ (-3) x = 11 ----------------------- -2 (a + 7) = -3a - 1 -2a - 14 = -3a - 1 -2a + 3a = -1 + 14 a = 13 -y + 6 = -8 -y = -8 - 6 -y = -14 l ÷ (-1) y = 14 6x + 4 = 7x - 11 6x - 7x = -11 - 4 -x = -15 l ÷ (-1) x = 15 ------------------- 0,3x + 0,11 = 5,21 0,3x = 5,21 - 0,11 0,3x = 5,1 l ÷ 0,3 x = 17 Myślę, że choć trochę pomogłam :)