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x in (-oo:+oo)
(2/5)*x-(2/3) = 5 // - 5
(2/5)*x-(2/3)-5 = 0
(2/5)*x-2/3-5 = 0
2/5*x-17/3 = 0 // + 17/3
2/5*x = 17/3 // : 2/5
x = 17/3/2/5
x = 85/6
x = 85/6
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