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(1/3)*x-((2/5)*x) = -7/15 // + -7/15
(1/3)*x-((2/5)*x)-(-7/15) = 0
(1/3)*x+(-2/5)*x+7/15 = 0
7/15-1/15*x = 0 // - 7/15
-1/15*x = -7/15 // : -1/15
x = -7/15/(-1/15)
x = 7
x = 7
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