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12-((1/4)*(x+15)) = 4 // - 4
12-((1/4)*(x+15))-4 = 0
(-1/4)*(x+15)-4+12 = 0
12-1/4*(x+15)-4 = 0
12-1/4*(x+15)-4 = 0
12-1/4*x-31/4 = 0
17/4-1/4*x = 0
17/4-1/4*x = 0
17/4-1/4*x = 0 // - 17/4
-1/4*x = -17/4 // : -1/4
x = -17/4/(-1/4)
x = 17
x = 17
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