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3x+20+x+11=6x+15
We move all terms to the left:
3x+20+x+11-(6x+15)=0
We add all the numbers together, and all the variables
4x-(6x+15)+31=0
We get rid of parentheses
4x-6x-15+31=0
We add all the numbers together, and all the variables
-2x+16=0
We move all terms containing x to the left, all other terms to the right
-2x=-16
x=-16/-2
x=+8
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