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x in (-oo:+oo)
1-3*x = 5*x-7 // - 5*x-7
1-3*x-(5*x)+7 = 0
1-3*x-5*x+7 = 0
8-8*x = 0 // - 8
-8*x = -8 // : -8
x = -8/(-8)
x = 1
x = 1
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