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1200a+45=1800-60
We move all terms to the left:
1200a+45-(1800-60)=0
We add all the numbers together, and all the variables
1200a+45-1740=0
We add all the numbers together, and all the variables
1200a-1695=0
We move all terms containing a to the left, all other terms to the right
1200a=1695
a=1695/1200
a=1+33/80
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