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x in (-oo:+oo)
2*x+8 = 6*x-28 // - 6*x-28
2*x-(6*x)+8+28 = 0
2*x-6*x+8+28 = 0
36-4*x = 0 // - 36
-4*x = -36 // : -4
x = -36/(-4)
x = 9
x = 9
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