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15 = 4.5*(1/3)*x // - 4.5*(1/3)*x
15-(4.5*(1/3)*x) = 0
15-1.5*x = 0
15-1.5*x = 0 // - 15
-1.5*x = -15 // : -1.5
x = -15/(-1.5)
x = 10
x = 10
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