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5a+10(a+5)+25(a+11)=805
We move all terms to the left:
5a+10(a+5)+25(a+11)-(805)=0
We multiply parentheses
5a+10a+25a+50+275-805=0
We add all the numbers together, and all the variables
40a-480=0
We move all terms containing a to the left, all other terms to the right
40a=480
a=480/40
a=12
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