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-((2/5)*x)-2/7 = -1/2 // + -1/2
-((2/5)*x)-2/7-(-1/2) = 0
(-2/5)*x-2/7+1/2 = 0
3/14-2/5*x = 0 // - 3/14
-2/5*x = -3/14 // : -2/5
x = -3/14/(-2/5)
x = 15/28
x = 15/28
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