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(3/4)*x-((1/4)*y) = -15/4 // + -15/4
(3/4)*x-((1/4)*y)-(-15/4) = 0
(3/4)*x+(-1/4)*y+15/4 = 0
3/4*x-1/4*y+15/4 = 0 // - 15/4-1/4*y
3/4*x = -(15/4-1/4*y) // : 3/4
x = (-(15/4-1/4*y))/3/4
x = -4/3*(15/4-1/4*y)
x = -4/3*(15/4-1/4*y)
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