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(x+6)+3x=20
We move all terms to the left:
(x+6)+3x-(20)=0
We add all the numbers together, and all the variables
3x+(x+6)-20=0
We get rid of parentheses
3x+x+6-20=0
We add all the numbers together, and all the variables
4x-14=0
We move all terms containing x to the left, all other terms to the right
4x=14
x=14/4
x=3+1/2
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