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