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x in (-oo:+oo)
x-(3/5) = (2*x)/7 // - (2*x)/7
x-((2*x)/7)-(3/5) = 0
x+(-2/7)*x-3/5 = 0
5/7*x-3/5 = 0 // + 3/5
5/7*x = 3/5 // : 5/7
x = 3/5/5/7
x = 21/25
x = 21/25
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