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5a+9=-126-10a
We move all terms to the left:
5a+9-(-126-10a)=0
We add all the numbers together, and all the variables
5a-(-10a-126)+9=0
We get rid of parentheses
5a+10a+126+9=0
We add all the numbers together, and all the variables
15a+135=0
We move all terms containing a to the left, all other terms to the right
15a=-135
a=-135/15
a=-9
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