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x in (-oo:+oo)
(1/2)*x+2/5 = 9/5 // - 9/5
(1/2)*x+2/5-(9/5) = 0
(1/2)*x+2/5-9/5 = 0
1/2*x-7/5 = 0 // + 7/5
1/2*x = 7/5 // : 1/2
x = 7/5/1/2
x = 14/5
x = 14/5
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