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x in (-oo:+oo)
(7-14)*x-(8/(-4))-12 = 0
(7-14)*x-12+2 = 0
-7*x-10 = 0 // + 10
-7*x = 10 // : -7
x = 10/(-7)
x = -10/7
x = -10/7
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