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-8a+199=-3a+154
We move all terms to the left:
-8a+199-(-3a+154)=0
We get rid of parentheses
-8a+3a-154+199=0
We add all the numbers together, and all the variables
-5a+45=0
We move all terms containing a to the left, all other terms to the right
-5a=-45
a=-45/-5
a=+9
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