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1/4a+21=0
We simplify the equation to the form, which is simple to understand
1/4a+21=0
We move all terms containing a to the left and all other terms to the right.
+4a=0-21
We simplify left and right side of the equation.
+4a=-21
We divide both sides of the equation by 4 to get a.
a=-5.25
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