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x in (-oo:+oo)
(-31/2)*x-5 = 7 // - 7
(-31/2)*x-7-5 = 0
-31/2*x-12 = 0 // + 12
-31/2*x = 12 // : -31/2
x = 12/(-31/2)
x = -24/31
x = -24/31
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