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x in (-oo:+oo)
(2/5)*x-((1/3)*x) = 3 // - 3
(2/5)*x-((1/3)*x)-3 = 0
(2/5)*x+(-1/3)*x-3 = 0
1/15*x-3 = 0 // + 3
1/15*x = 3 // : 1/15
x = 3/1/15
x = 45
x = 45
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