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4a+7(2a-5)-5(3a+11)=50
We move all terms to the left:
4a+7(2a-5)-5(3a+11)-(50)=0
We multiply parentheses
4a+14a-15a-35-55-50=0
We add all the numbers together, and all the variables
3a-140=0
We move all terms containing a to the left, all other terms to the right
3a=140
a=140/3
a=46+2/3
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