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(12+a)/2=-7
We move all terms to the left:
(12+a)/2-(-7)=0
We add all the numbers together, and all the variables
(a+12)/2-(-7)=0
We add all the numbers together, and all the variables
(a+12)/2+7=0
We multiply all the terms by the denominator
(a+12)+7*2=0
We add all the numbers together, and all the variables
(a+12)+14=0
We get rid of parentheses
a+12+14=0
We add all the numbers together, and all the variables
a+26=0
We move all terms containing a to the left, all other terms to the right
a=-26
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