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.25a+21=0
We simplify the equation to the form, which is simple to understand
.25a+21=0
We move all terms containing a to the left and all other terms to the right.
+ 0.25a=0-21
We simplify left and right side of the equation.
+ 0.25a=-21
We divide both sides of the equation by 0.25 to get a.
a=-84
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