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