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(7/5)*x+2/5 = -x // + x
(7/5)*x+x+2/5 = 0
12/5*x+2/5 = 0 // - 2/5
12/5*x = -2/5 // : 12/5
x = -2/5/12/5
x = -1/6
x = -1/6
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