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x in (-oo:+oo)
2*(-(3*x)-4) = 40 // - 40
2*(-(3*x)-4)-40 = 0
2*(-3*x-4)-40 = 0
2*(-3*x-4)-40 = 0
-6*x-48 = 0
-6*x-48 = 0
-6*x-48 = 0 // + 48
-6*x = 48 // : -6
x = 48/(-6)
x = -8
x = -8
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