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-198=-8-10a
We move all terms to the left:
-198-(-8-10a)=0
We add all the numbers together, and all the variables
-(-10a-8)-198=0
We get rid of parentheses
10a+8-198=0
We add all the numbers together, and all the variables
10a-190=0
We move all terms containing a to the left, all other terms to the right
10a=190
a=190/10
a=19
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