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x in (-oo:+oo)
(-9*5)/2+12/3-4+7 = x // - x
(-9*5)/2-x+12/3-4+7 = 0
-x-31/2 = 0 // + 31/2
-x = 31/2 // * -1
x = -31/2
x = -31/2
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