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x in (-oo:+oo)
10-x-(5/2) = 40 // - 40
10-x-(5/2)-40 = 0
10-x-5/2-40 = 0
-x-65/2 = 0 // + 65/2
-x = 65/2 // * -1
x = -65/2
x = -65/2
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