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a+4+(2a-9)+2a=180
We move all terms to the left:
a+4+(2a-9)+2a-(180)=0
We add all the numbers together, and all the variables
3a+(2a-9)-176=0
We get rid of parentheses
3a+2a-9-176=0
We add all the numbers together, and all the variables
5a-185=0
We move all terms containing a to the left, all other terms to the right
5a=185
a=185/5
a=37
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