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x in (-oo:+oo)
x-(4*x)+7 = 1 // - 1
x-(4*x)-1+7 = 0
x-4*x-1+7 = 0
6-3*x = 0 // - 6
-3*x = -6 // : -3
x = -6/(-3)
x = 2
x = 2
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