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7=4a+5
We move all terms to the left:
7-(4a+5)=0
We get rid of parentheses
-4a-5+7=0
We add all the numbers together, and all the variables
-4a+2=0
We move all terms containing a to the left, all other terms to the right
-4a=-2
a=-2/-4
a=1/2
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