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8*x-(x*(y/4))-(7*y) = 0
8*x-(x*(y/4))-7*y = 0
-1/4*x*y-7*y = 0 // + -7*y
-1/4*x*y = -(-7*y) // : -1/4*y
x = (-(-7*y))/(-1/4*y)
x = -28
x = -28
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