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(1/3)*(15-(6*x)) = 4-x // - 4-x
(1/3)*(15-(6*x))+x-4 = 0
(1/3)*(15-6*x)+x-4 = 0
1/3*(15-6*x)+x-4 = 0
1/3*(15-6*x)+x-4 = 0
5-x-4 = 0
1-x = 0
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x = 1
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