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x in (-oo:+oo)
x-2/5 = 13/5-2*x // - 13/5-2*x
x-(-2*x)-2/5-(13/5) = 0
x+2*x-2/5-13/5 = 0
3*x-3 = 0 // + 3
3*x = 3 // : 3
x = 3/3
x = 1
x = 1
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