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(5/2)*x-((9/2)*y)+9/2 = 0
(5/2)*x+(-9/2)*y+9/2 = 0
5/2*x-9/2*y+9/2 = 0 // - 9/2-9/2*y
5/2*x = -(9/2-9/2*y) // : 5/2
x = (-(9/2-9/2*y))/5/2
x = -2/5*(9/2-9/2*y)
x = -2/5*(9/2-9/2*y)
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