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