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3+(0.25a)=31
We move all terms to the left:
3+(0.25a)-(31)=0
We add all the numbers together, and all the variables
(+0.25a)+3-31=0
We add all the numbers together, and all the variables
(+0.25a)-28=0
We get rid of parentheses
0.25a-28=0
We move all terms containing a to the left, all other terms to the right
0.25a=28
a=28/0.25
a=112
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