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(3/4)*x-(2*y) = 15 // - 15
(3/4)*x-(2*y)-15 = 0
(3/4)*x-2*y-15 = 0
3/4*x-2*y-15 = 0 // + -2*y-15
3/4*x = -(-2*y-15) // : 3/4
x = (-(-2*y-15))/3/4
x = 4/3*(15-(-2*y))
x = 4/3*(15-(-2*y))
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