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x in (-oo:+oo)
(-1/2)*x-10 = 27.5 // - 27.5
(-1/2)*x-27.5-10 = 0
-1/2*x-37.5 = 0 // + 37.5
-1/2*x = 37.5 // : -1/2
x = 37.5/(-1/2)
x = -75
x = -75
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