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(-1/2)*x-10 = -27.5 // + 27.5
(-1/2)*x-10+27.5 = 0
17.5-1/2*x = 0 // - 17.5
-1/2*x = -17.5 // : -1/2
x = -17.5/(-1/2)
x = 35
x = 35
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