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x in (-oo:+oo)
(2/5)*x = (1/3)*x+5 // - (1/3)*x+5
(2/5)*x-((1/3)*x)-5 = 0
(2/5)*x+(-1/3)*x-5 = 0
1/15*x-5 = 0 // + 5
1/15*x = 5 // : 1/15
x = 5/1/15
x = 75
x = 75
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