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x in (-oo:+oo)
(-7*x)/2-14 = -57 // + 57
(-7*x)/2-14+57 = 0
43-7/2*x = 0 // - 43
-7/2*x = -43 // : -7/2
x = -43/(-7/2)
x = 86/7
x = 86/7
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