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(-1/7)*(7*x-(35*y)) = 0
(-1/7)*(7*x-35*y) = 0
-1/7*(7*x-35*y) = 0
7*x-35*y = 0 // + -35*y
7*x = -(-35*y) // : 7
x = (-(-35*y))/7
x = 5*y
x = 5*y
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