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(2/5)*x+(1/4)*x = x+5/4 // - x+5/4
(2/5)*x+(1/4)*x-x-(5/4) = 0
(2/5)*x+(1/4)*x-x-5/4 = 0
-7/20*x-5/4 = 0 // + 5/4
-7/20*x = 5/4 // : -7/20
x = 5/4/(-7/20)
x = -25/7
x = -25/7
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