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x in (-oo:+oo)
7*x+3/5 = -417/5 // + -417/5
7*x+3/5-(-417/5) = 0
7*x+3/5+417/5 = 0
7*x+84 = 0 // - 84
7*x = -84 // : 7
x = -84/7
x = -12
x = -12
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