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x in (-oo:+oo)
3*x+1 = 6*x+28 // - 6*x+28
3*x-(6*x)-28+1 = 0
3*x-6*x-28+1 = 0
-3*x-27 = 0 // + 27
-3*x = 27 // : -3
x = 27/(-3)
x = -9
x = -9
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