a) -5x - 5 = 5 -5x = 5 + 5 -5x = 10 /:(-5) x = -2 b) 12x + 4 = -6 1/2x = -10 /*(2) x = -20 c) 0.6 - 3/4x = -13 3/5 - 3/4x = -1/3 /*60 36 - 45x = -20 -45x = -56 /;(-45) x = 1 11/45 d) 3x - 4 = 5x + 2 3x - 5x = 2 + 4 -2x = 6 /;(-2) x = -3 e)7 - 2x = 7x - 2 -2x-7x = -2 - 7 -9x = -9 /:(-9) x = 1 f) 23 (6x - 9) = 12 4x - 6 = 12 4x = 12+6 4x = 18 /:4 x = 4 1/2 g)110 (25x - 40) + 2 = 34 (8x + 12) -9 2,5x - 4 + 2 = 6x + 9 - 9 2,5x - 6x = 2 -3,5x = 2 /:(-3,5) x = 2 * (-2/7) x = -4/7
a) -5x - 5 = 5 +5+5x 0=10+5x -10 -10=5x /5 -2=x b) 12x + 4 = -6 +6 1/2x+10= 0 -10 1/2x=-10 *2/1 x=-20 c) 0.6 - 3/4x = -13 +3/4x 0,6=-1/3+3/4x +1/3 6/10+1/3=3/4x 18/30+10/30=3/4x 28/30=3/4x 14/15=3/4x *4/3 56/45=x 1 11/45=x d) 3x - 4 = 5x + 2 +4 3x=5x+6 -3x-6 -6=2x /2 -3=x e)7 - 2x = 7x - 2 +2+2x 9=9x /9 1=x f) 23 (6x - 9) = 12 4x-6=12 +6 4x=18 /4 x=4,5 g)110 (25x - 40) + 2 = 34 (8x + 12) -9 2,5x-4+2=6x+9-9 2,5x-2=6x +2 2,5x=6x +2 -2,5x 0= 3,5x+2 -2 -2=3,5x -4/2=3 5/10x -20/10=35/10 x *10/35 -200/350=x 2/3,5=x
