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x in (-oo:+oo)
(2/5)*x = (1/3)*x+6 // - (1/3)*x+6
(2/5)*x-((1/3)*x)-6 = 0
(2/5)*x+(-1/3)*x-6 = 0
1/15*x-6 = 0 // + 6
1/15*x = 6 // : 1/15
x = 6/1/15
x = 90
x = 90
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