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x in (-oo:+oo)
-5 = 2*x-(6*x)+7 // - 2*x-(6*x)+7
6*x-(2*x)-7-5 = 0
6*x-2*x-7-5 = 0
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
x = 3
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