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2x+21=118-5x+40/2
We move all terms to the left:
2x+21-(118-5x+40/2)=0
We add all the numbers together, and all the variables
2x-(-5x+138)+21=0
We get rid of parentheses
2x+5x-138+21=0
We add all the numbers together, and all the variables
7x-117=0
We move all terms containing x to the left, all other terms to the right
7x=117
x=117/7
x=16+5/7
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