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x in (-oo:+oo)
(1/3)*x-(1/2) = 1/5 // - 1/5
(1/3)*x-(1/2)-(1/5) = 0
(1/3)*x-1/2-1/5 = 0
1/3*x-7/10 = 0 // + 7/10
1/3*x = 7/10 // : 1/3
x = 7/10/1/3
x = 21/10
x = 21/10
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