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(1/3)*(x+1) = 12 // - 12
(1/3)*(x+1)-12 = 0
1/3*(x+1)-12 = 0
1/3*(x+1)-12 = 0
1/3*x-35/3 = 0
1/3*x-35/3 = 0
1/3*x-35/3 = 0 // + 35/3
1/3*x = 35/3 // : 1/3
x = 35/3/1/3
x = 35
x = 35
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