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