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4*x+5 = (-1/3)*(x-12) // - (-1/3)*(x-12)
4*x-((-1/3)*(x-12))+5 = 0
(1/3)*(x-12)+4*x+5 = 0
1/3*(x-12)+4*x+5 = 0
1/3*(x-12)+4*x+5 = 0
13/3*x-4+5 = 0
13/3*x+1 = 0
13/3*x+1 = 0
13/3*x+1 = 0 // - 1
13/3*x = -1 // : 13/3
x = -1/13/3
x = -3/13
x = -3/13
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