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x in (-oo:+oo)
(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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