Wyznacz wartosc zmienne x z rownosci ; a) 3(2x-4) = 2x + 8 b) (3x-1) (2x+7) = 6x² +31 c) 5x+3 ___________ -2=4 6

a) 6x-12=2x+8 6x-2x = 8+12 4x = 20 x = 5 b) 6x²+21x-2x-7 = 6x² + 31 6x²-6x²+19x = 31+7 19x = 38 /:19 x = 2 c)(5x+3)/6=6 /*6 5x+3 = 36 5x = 33 /:5 x = 6,6

a) 3(2x-4) = 2x + 8 6x-12=2x+8 /-2x 4x-12=8 /+12 4x=20 /:4 x=5 b)(3x-1) (2x+7) = 6x² +31 6x²+21x-2x-7=6x²+31 /-6x² 2-19x-7=31 /+7 2-19x=38 x=2 5x+3 _________ -2=4 /+2 6 5x+3 --------=6 /*6 6 5x+3=36 5x=33 x=33/5=6 3/5