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