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x in (-oo:+oo)
(3*(5-(3*x)))/(-4) = -15 // + 15
(3*(5-(3*x)))/(-4)+15 = 0
(3*(5-3*x))/(-4)+15 = 0
(3*(5-3*x))/(-4)+(-4*15)/(-4) = 0
3*(5-3*x)-4*15 = 0
-9*x-45 = 0
(-9*x-45)/(-4) = 0
(-9*x-45)/(-4) = 0 // * -4
-9*x-45 = 0
-9*x-45 = 0 // + 45
-9*x = 45 // : -9
x = 45/(-9)
x = -5
x = -5
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