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(2/5)*x+3/5 = -4 // + 4
(2/5)*x+3/5+4 = 0
2/5*x+23/5 = 0 // - 23/5
2/5*x = -23/5 // : 2/5
x = -23/5/2/5
x = -23/2
x = -23/2
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