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x in (-oo:+oo)
x/3+1 = x/7+5 // - x/7+5
x/3-(x/7)-5+1 = 0
4/21*x-4 = 0 // + 4
4/21*x = 4 // : 4/21
x = 4/4/21
x = 21
x = 21
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