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x in (-oo:+oo)
2*(-1*x-7) = -28 // + 28
2*(-1*x-7)+28 = 0
2*(-x-7)+28 = 0
2*(-x-7)+28 = 0
14-2*x = 0
14-2*x = 0
14-2*x = 0 // - 14
-2*x = -14 // : -2
x = -14/(-2)
x = 7
x = 7
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