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7(1-7a)+3=-2a-37
We move all terms to the left:
7(1-7a)+3-(-2a-37)=0
We add all the numbers together, and all the variables
7(-7a+1)-(-2a-37)+3=0
We multiply parentheses
-49a-(-2a-37)+7+3=0
We get rid of parentheses
-49a+2a+37+7+3=0
We add all the numbers together, and all the variables
-47a+47=0
We move all terms containing a to the left, all other terms to the right
-47a=-47
a=-47/-47
a=1
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