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34a-15=30-40a
We move all terms to the left:
34a-15-(30-40a)=0
We add all the numbers together, and all the variables
34a-(-40a+30)-15=0
We get rid of parentheses
34a+40a-30-15=0
We add all the numbers together, and all the variables
74a-45=0
We move all terms containing a to the left, all other terms to the right
74a=45
a=45/74
a=45/74
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