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2(15+x)=48
We move all terms to the left:
2(15+x)-(48)=0
We add all the numbers together, and all the variables
2(x+15)-48=0
We multiply parentheses
2x+30-48=0
We add all the numbers together, and all the variables
2x-18=0
We move all terms containing x to the left, all other terms to the right
2x=18
x=18/2
x=9
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