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x in (-oo:+oo)
(2/5)*x = 1+2 // - 1+2
(2/5)*x-2-1 = 0
2/5*x-3 = 0 // + 3
2/5*x = 3 // : 2/5
x = 3/2/5
x = 15/2
x = 15/2
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