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-10a+4=-a-86
We move all terms to the left:
-10a+4-(-a-86)=0
We add all the numbers together, and all the variables
-10a-(-1a-86)+4=0
We get rid of parentheses
-10a+1a+86+4=0
We add all the numbers together, and all the variables
-9a+90=0
We move all terms containing a to the left, all other terms to the right
-9a=-90
a=-90/-9
a=+10
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