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(1/3)*x-((1/3)*(2*x-15)) = 3*(1/2) // - 3*(1/2)
(1/3)*x-((1/3)*(2*x-15))-(3*(1/2)) = 0
(-1/3)*(2*x-15)+(1/3)*x-3/2 = 0
x/3-1/3*(2*x-15)-3/2 = 0
(-1/3*2*3*(2*x-15))/(2*3)+(2*x)/(2*3)+(-3*3)/(2*3) = 0
2*x-1/3*2*3*(2*x-15)-3*3 = 0
30-2*x-9 = 0
21-2*x = 0
(21-2*x)/(2*3) = 0
(21-2*x)/(2*3) = 0 // * 2*3
21-2*x = 0
21-2*x = 0 // - 21
-2*x = -21 // : -2
x = -21/(-2)
x = 21/2
x = 21/2
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