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2*((1/3)*x+5)+(1/3)*x = 12 // - 12
2*((1/3)*x+5)+(1/3)*x-12 = 0
2*(1/3*x+5)+x/3-12 = 0
(2*3*(1/3*x+5))/3+x/3+(-12*3)/3 = 0
2*3*(1/3*x+5)+x-12*3 = 0
3*x-36+30 = 0
3*x-6 = 0
(3*x-6)/3 = 0
(3*x-6)/3 = 0 // * 3
3*x-6 = 0
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
x = 2
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