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(2/5)*x-(1/3) = -x-(2/3) // + -x-(2/3)
(2/5)*x+x-(1/3)+2/3 = 0
(2/5)*x+x-1/3+2/3 = 0
7/5*x+1/3 = 0 // - 1/3
7/5*x = -1/3 // : 7/5
x = -1/3/7/5
x = -5/21
x = -5/21
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