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3*y-(4*x)+4.5/3 = -12 // + 12
3*y-(4*x)+4.5/3+12 = 0
3*y-4*x+4.5/3+12 = 0
3*y-4*x+13.5 = 0 // - 3*y+13.5
-4*x = -(3*y+13.5) // : -4
x = (-(3*y+13.5))/(-4)
x = (3*y+13.5)/4
x = (3*y+13.5)/4
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