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x in (-oo:+oo)
x/4+14 = 2*x // - 2*x
x/4-(2*x)+14 = 0
x/4-2*x+14 = 0
14-7/4*x = 0 // - 14
-7/4*x = -14 // : -7/4
x = -14/(-7/4)
x = 8
x = 8
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