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x in (-oo:+oo)
6*x+7 = 39-2*x // - 39-2*x
6*x-(-2*x)-39+7 = 0
6*x+2*x-39+7 = 0
8*x-32 = 0 // + 32
8*x = 32 // : 8
x = 32/8
x = 4
x = 4
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