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(1/3)*(2*x-9)+(2/3)*x+1 = 0
1/3*(2*x-9)+(2*x)/3+1 = 0
(1/3*3*(2*x-9))/3+(2*x)/3+(1*3)/3 = 0
1/3*3*(2*x-9)+2*x+1*3 = 0
4*x-9+3 = 0
4*x-6 = 0
(4*x-6)/3 = 0
(4*x-6)/3 = 0 // * 3
4*x-6 = 0
4*x-6 = 0 // + 6
4*x = 6 // : 4
x = 6/4
x = 3/2
x = 3/2
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