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40-2a+5a=68+1a
We move all terms to the left:
40-2a+5a-(68+1a)=0
We add all the numbers together, and all the variables
-2a+5a-(a+68)+40=0
We add all the numbers together, and all the variables
3a-(a+68)+40=0
We get rid of parentheses
3a-a-68+40=0
We add all the numbers together, and all the variables
2a-28=0
We move all terms containing a to the left, all other terms to the right
2a=28
a=28/2
a=14
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