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(8*x)/9+7 = 8*y+7/9 // - 8*y+7/9
(8*x)/9-(8*y)-(7/9)+7 = 0
(8*x)/9-8*y-7/9+7 = 0
8/9*x-8*y+56/9 = 0 // - 56/9-8*y
8/9*x = -(56/9-8*y) // : 8/9
x = (-(56/9-8*y))/8/9
x = -9/8*(56/9-8*y)
x = -9/8*(56/9-8*y)
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