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x in (-oo:+oo)
2*x+8 = 4*x+28 // - 4*x+28
2*x-(4*x)-28+8 = 0
2*x-4*x-28+8 = 0
-2*x-20 = 0 // + 20
-2*x = 20 // : -2
x = 20/(-2)
x = -10
x = -10
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