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x in (-oo:+oo)
25 = 2*x-(6*x)-7 // - 2*x-(6*x)-7
6*x-(2*x)+7+25 = 0
6*x-2*x+7+25 = 0
4*x+32 = 0 // - 32
4*x = -32 // : 4
x = -32/4
x = -8
x = -8
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