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-2*x-(2/5) = -31/15 // + -31/15
-2*x-(2/5)-(-31/15) = 0
31/15-2*x-2/5 = 0
5/3-2*x = 0 // - 5/3
-2*x = -5/3 // : -2
x = -5/3/(-2)
x = 5/6
x = 5/6
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