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-7a+a=-10-4a
We move all terms to the left:
-7a+a-(-10-4a)=0
We add all the numbers together, and all the variables
-7a+a-(-4a-10)=0
We add all the numbers together, and all the variables
-6a-(-4a-10)=0
We get rid of parentheses
-6a+4a+10=0
We add all the numbers together, and all the variables
-2a+10=0
We move all terms containing a to the left, all other terms to the right
-2a=-10
a=-10/-2
a=+5
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