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(2/5)*x-((5/3)*x) = 1/15 // - 1/15
(2/5)*x-((5/3)*x)-(1/15) = 0
(2/5)*x+(-5/3)*x-1/15 = 0
-19/15*x-1/15 = 0 // + 1/15
-19/15*x = 1/15 // : -19/15
x = 1/15/(-19/15)
x = -1/19
x = -1/19
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