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x in (-oo:+oo)
3-7*x = -(5*x)-3 // + -(5*x)-3
5*x-7*x+3+3 = 0
6-2*x = 0 // - 6
-2*x = -6 // : -2
x = -6/(-2)
x = 3
x = 3
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