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10a-15-4a=8-2a-15
We move all terms to the left:
10a-15-4a-(8-2a-15)=0
We add all the numbers together, and all the variables
10a-4a-(-2a-7)-15=0
We add all the numbers together, and all the variables
6a-(-2a-7)-15=0
We get rid of parentheses
6a+2a+7-15=0
We add all the numbers together, and all the variables
8a-8=0
We move all terms containing a to the left, all other terms to the right
8a=8
a=8/8
a=1
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