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