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15-(x/3) = -x/5 // + -x/5
15-(x/3)-(-x/5) = 0
(1/5)*x-(x/3)+15 = 0
15-2/15*x = 0 // - 15
-2/15*x = -15 // : -2/15
x = -15/(-2/15)
x = 225/2
x = 225/2
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