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8+7 = x +4x
15 = 5x
15/5 = x
3 = x
x +5
x +3
5x + 3x = 8x
(x+5)(x+3) = 0
x +5 = 0 x+3 = 0
x = -5 x= -3
CS = (-5;-3)
4x(3x-1) = 0
4x = 0 3x - 1 = 0
x = 0/4 3x = 1
x = 0 x = 1/3
CS = (0; 1/3)