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(5/4)*x-((3/4)*y) = 9/4 // - 9/4
(5/4)*x-((3/4)*y)-(9/4) = 0
(5/4)*x+(-3/4)*y-9/4 = 0
5/4*x-3/4*y-9/4 = 0 // + -3/4*y-9/4
5/4*x = -(-3/4*y-9/4) // : 5/4
x = (-(-3/4*y-9/4))/5/4
x = 4/5*(9/4-(-3/4*y))
x = 4/5*(9/4-(-3/4*y))
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