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2/5-((3/8)*x) = -1/10 // + -1/10
2/5-((3/8)*x)-(-1/10) = 0
(-3/8)*x+2/5+1/10 = 0
1/2-3/8*x = 0 // - 1/2
-3/8*x = -1/2 // : -3/8
x = -1/2/(-3/8)
x = 4/3
x = 4/3
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