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8*x-(7*y) = (-72*(-56))/49 // - (-72*(-56))/49
8*x-(7*y)-((-72*(-56))/49) = 0
8*x-7*y-576/7 = 0
8*x-7*y-576/7 = 0 // + -7*y-576/7
8*x = -(-7*y-576/7) // : 8
x = (-(-7*y-576/7))/8
x = (576/7-(-7*y))/8
x = (576/7-(-7*y))/8
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