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7(a+5)=30
We move all terms to the left:
7(a+5)-(30)=0
We multiply parentheses
7a+35-30=0
We add all the numbers together, and all the variables
7a+5=0
We move all terms containing a to the left, all other terms to the right
7a=-5
a=-5/7
a=-5/7
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