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x in (-oo:+oo)
(2*x)/5-(x/3) = 4 // - 4
(2*x)/5-(x/3)-4 = 0
1/15*x-4 = 0 // + 4
1/15*x = 4 // : 1/15
x = 4/1/15
x = 60
x = 60
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