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x in (-oo:+oo)
7-x = 3*x+47 // - 3*x+47
7-x-(3*x)-47 = 0
7-x-3*x-47 = 0
-4*x-40 = 0 // + 40
-4*x = 40 // : -4
x = 40/(-4)
x = -10
x = -10
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