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(2/5)*x-((1/3)*x) = 4 // - 4
(2/5)*x-((1/3)*x)-4 = 0
(2/5)*x+(-1/3)*x-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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