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x in (-oo:+oo)
-2*7-6*(-3)-(2*(40/(-8))) = x // - x
-x-2*7-6*(-3)-(2*(40/(-8))) = 0
10-x-2*7-6*(-3) = 0
14-x = 0 // - 14
-x = -14 // * -1
x = 14
x = 14
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