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x in (-oo:+oo)
-7 = (5*x-12)/(-4) // - (5*x-12)/(-4)
-((5*x-12)/(-4))-7 = 0
(-1*(5*x-12))/(-4)-7 = 0
(-1*(5*x-12))/(-4)+(-7*(-4))/(-4) = 0
-1*(5*x-12)-7*(-4) = 0
40-5*x = 0
(40-5*x)/(-4) = 0
(40-5*x)/(-4) = 0 // * -4
40-5*x = 0
40-5*x = 0 // - 40
-5*x = -40 // : -5
x = -40/(-5)
x = 8
x = 8
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