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