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x in (-oo:+oo)
4-(6*x) = 6*x-68 // - 6*x-68
4-(6*x)-(6*x)+68 = 0
4-6*x-6*x+68 = 0
72-12*x = 0 // - 72
-12*x = -72 // : -12
x = -72/(-12)
x = 6
x = 6
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