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1/5-(x/3) = -2/3 // + -2/3
1/5-(x/3)-(-2/3) = 0
1/5-(x/3)+2/3 = 0
13/15-1/3*x = 0 // - 13/15
-1/3*x = -13/15 // : -1/3
x = -13/15/(-1/3)
x = 13/5
x = 13/5
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