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x in (-oo:+oo)
2-7*x = 7*x+114 // - 7*x+114
2-7*x-(7*x)-114 = 0
2-7*x-7*x-114 = 0
-14*x-112 = 0 // + 112
-14*x = 112 // : -14
x = 112/(-14)
x = -8
x = -8
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