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x in (-oo:+oo)
5*x-(7*x)+6 = 2 // - 2
5*x-(7*x)-2+6 = 0
5*x-7*x-2+6 = 0
4-2*x = 0 // - 4
-2*x = -4 // : -2
x = -4/(-2)
x = 2
x = 2
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