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4(7+5a)=128
We move all terms to the left:
4(7+5a)-(128)=0
We add all the numbers together, and all the variables
4(5a+7)-128=0
We multiply parentheses
20a+28-128=0
We add all the numbers together, and all the variables
20a-100=0
We move all terms containing a to the left, all other terms to the right
20a=100
a=100/20
a=5
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