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-((1/3)*x)-1/2 = 4/5 // - 4/5
-((1/3)*x)-1/2-(4/5) = 0
(-1/3)*x-1/2-4/5 = 0
-1/3*x-13/10 = 0 // + 13/10
-1/3*x = 13/10 // : -1/3
x = 13/10/(-1/3)
x = -39/10
x = -39/10
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