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x in (-oo:+oo)
(1/3)*x = 7/15 // - 7/15
(1/3)*x-(7/15) = 0
(1/3)*x-7/15 = 0
1/3*x-7/15 = 0 // + 7/15
1/3*x = 7/15 // : 1/3
x = 7/15/1/3
x = 7/5
x = 7/5
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