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x in (-oo:+oo)
(1/3)*x-((1/5)*x) = 4 // - 4
(1/3)*x-((1/5)*x)-4 = 0
(1/3)*x+(-1/5)*x-4 = 0
2/15*x-4 = 0 // + 4
2/15*x = 4 // : 2/15
x = 4/2/15
x = 30
x = 30
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