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