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x in (-oo:+oo)
1-(7*x) = -3*x-7 // + -3*x-7
1-(7*x)-(-3*x)+7 = 0
3*x-7*x+1+7 = 0
8-4*x = 0 // - 8
-4*x = -8 // : -4
x = -8/(-4)
x = 2
x = 2
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