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x in (-oo:+oo)
2*(x/y) = 10 // - 10
2*(x/y)-10 = 0
2*x*y^-1-10 = 0 // + 10
2*x*y^-1 = 10 // : 2*y^-1
x = 10/(2*y^-1)
x = 5*y
x = 5*y
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