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3*y-(6*y)-(8/7) = x // - x
3*y-x-(6*y)-(8/7) = 0
3*y-x-6*y-8/7 = 0
-x-3*y-8/7 = 0 // + -3*y-8/7
-x = -(-3*y-8/7) // * -1
x = -3*y-8/7
x = -3*y-8/7
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