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x in (-oo:+oo)
x/3 = 5/7 // - 5/7
x/3-(5/7) = 0
x/3-5/7 = 0
1/3*x-5/7 = 0 // + 5/7
1/3*x = 5/7 // : 1/3
x = 5/7/1/3
x = 15/7
x = 15/7
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