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4(41+a)=12
We move all terms to the left:
4(41+a)-(12)=0
We add all the numbers together, and all the variables
4(a+41)-12=0
We multiply parentheses
4a+164-12=0
We add all the numbers together, and all the variables
4a+152=0
We move all terms containing a to the left, all other terms to the right
4a=-152
a=-152/4
a=-38
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