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30+.15a=117.15
We simplify the equation to the form, which is simple to understand
30+.15a=117.15
We move all terms containing a to the left and all other terms to the right.
+ 0.15a=+117.15-30
We simplify left and right side of the equation.
+ 0.15a=+87.15
We divide both sides of the equation by 0.15 to get a.
a=581
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