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(2/5)*x+6/5 = -2/5 // + -2/5
(2/5)*x+6/5-(-2/5) = 0
(2/5)*x+6/5+2/5 = 0
2/5*x+8/5 = 0 // - 8/5
2/5*x = -8/5 // : 2/5
x = -8/5/2/5
x = -4
x = -4
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