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x in (-oo:+oo)
(-x-2)/(-4) = (3*x+6)/2 // - (3*x+6)/2
(-x-2)/(-4)-((3*x+6)/2) = 0
(-x-2)/(-4)+(-1*(3*x+6))/2 = 0
(2*(-x-2))/(-4*2)+(-4*(-1)*(3*x+6))/(-4*2) = 0
2*(-x-2)-4*(-1)*(3*x+6) = 0
10*x+20 = 0
(10*x+20)/(-4*2) = 0
(10*x+20)/(-4*2) = 0 // * -4*2
10*x+20 = 0
10*x+20 = 0 // - 20
10*x = -20 // : 10
x = -20/10
x = -2
x = -2
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