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(1/4)*x+6*x+2/5 = -617/20 // + -617/20
(1/4)*x+6*x+2/5-(-617/20) = 0
(1/4)*x+6*x+2/5+617/20 = 0
25/4*x+125/4 = 0 // - 125/4
25/4*x = -125/4 // : 25/4
x = -125/4/25/4
x = -5
x = -5
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