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4/5-((1/2)*x) = -17/10 // + -17/10
4/5-((1/2)*x)-(-17/10) = 0
(-1/2)*x+4/5+17/10 = 0
5/2-1/2*x = 0 // - 5/2
-1/2*x = -5/2 // : -1/2
x = -5/2/(-1/2)
x = 5
x = 5
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