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1800a=21(136+18a)
We move all terms to the left:
1800a-(21(136+18a))=0
We add all the numbers together, and all the variables
1800a-(21(18a+136))=0
We calculate terms in parentheses: -(21(18a+136)), so:We get rid of parentheses
21(18a+136)
We multiply parentheses
378a+2856
Back to the equation:
-(378a+2856)
1800a-378a-2856=0
We add all the numbers together, and all the variables
1422a-2856=0
We move all terms containing a to the left, all other terms to the right
1422a=2856
a=2856/1422
a=2+2/237
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