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x in (-oo:+oo)
(1/5)*x-((1/3)*y) = 1/7 // - 1/7
(1/5)*x-((1/3)*y)-(1/7) = 0
(1/5)*x+(-1/3)*y-1/7 = 0
1/5*x-1/3*y-1/7 = 0 // + -1/3*y-1/7
1/5*x = -(-1/3*y-1/7) // : 1/5
x = (-(-1/3*y-1/7))/1/5
x = 5*(1/7-(-1/3*y))
x = 5*(1/7-(-1/3*y))
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