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(1+3)x=11+x
We move all terms to the left:
(1+3)x-(11+x)=0
We add all the numbers together, and all the variables
4x-(x+11)=0
We get rid of parentheses
4x-x-11=0
We add all the numbers together, and all the variables
3x-11=0
We move all terms containing x to the left, all other terms to the right
3x=11
x=11/3
x=3+2/3
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