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x in (-oo:+oo)
(1/3)*x+(1/5)*x+1/3 = 7/5 // - 7/5
(1/3)*x+(1/5)*x+1/3-(7/5) = 0
(1/3)*x+(1/5)*x+1/3-7/5 = 0
8/15*x-16/15 = 0 // + 16/15
8/15*x = 16/15 // : 8/15
x = 16/15/8/15
x = 2
x = 2
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