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5*x-(4*y) = (-63*(-20))/4 // - (-63*(-20))/4
5*x-(4*y)-((-63*(-20))/4) = 0
5*x-4*y-315 = 0
5*x-4*y-315 = 0 // + -4*y-315
5*x = -(-4*y-315) // : 5
x = (-(-4*y-315))/5
x = (315-(-4*y))/5
x = (315-(-4*y))/5
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