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5(4a+7)=175
We move all terms to the left:
5(4a+7)-(175)=0
We multiply parentheses
20a+35-175=0
We add all the numbers together, and all the variables
20a-140=0
We move all terms containing a to the left, all other terms to the right
20a=140
a=140/20
a=7
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