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x in (-oo:+oo)
(2/5)*x = 10/30 // - 10/30
(2/5)*x-(10/30) = 0
(2/5)*x-1/3 = 0
2/5*x-1/3 = 0 // + 1/3
2/5*x = 1/3 // : 2/5
x = 1/3/2/5
x = 5/6
x = 5/6
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