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(x+6)+(x+15)=54
We move all terms to the left:
(x+6)+(x+15)-(54)=0
We get rid of parentheses
x+x+6+15-54=0
We add all the numbers together, and all the variables
2x-33=0
We move all terms containing x to the left, all other terms to the right
2x=33
x=33/2
x=16+1/2
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