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12-((3/4)*(x+15)) = 4 // - 4
12-((3/4)*(x+15))-4 = 0
(-3/4)*(x+15)-4+12 = 0
12-3/4*(x+15)-4 = 0
12-3/4*(x+15)-4 = 0
12-3/4*x-61/4 = 0
-3/4*x-13/4 = 0
-3/4*x-13/4 = 0
-3/4*x-13/4 = 0 // + 13/4
-3/4*x = 13/4 // : -3/4
x = 13/4/(-3/4)
x = -13/3
x = -13/3
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