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10a-4=16a+9=180
We move all terms to the left:
10a-4-(16a+9)=0
We get rid of parentheses
10a-16a-9-4=0
We add all the numbers together, and all the variables
-6a-13=0
We move all terms containing a to the left, all other terms to the right
-6a=13
a=13/-6
a=-2+1/6
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