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x in (-oo:+oo)
6-3*x = 4*x-71 // - 4*x-71
6-3*x-(4*x)+71 = 0
6-3*x-4*x+71 = 0
77-7*x = 0 // - 77
-7*x = -77 // : -7
x = -77/(-7)
x = 11
x = 11
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