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(1/3)*(6*x+21) = 11 // - 11
(1/3)*(6*x+21)-11 = 0
1/3*(6*x+21)-11 = 0
1/3*(6*x+21)-11 = 0
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
x = 2
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