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x in (-oo:+oo)
4*x+2 = 7*x+14 // - 7*x+14
4*x-(7*x)-14+2 = 0
4*x-7*x-14+2 = 0
-3*x-12 = 0 // + 12
-3*x = 12 // : -3
x = 12/(-3)
x = -4
x = -4
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