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