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.25(18-a)+8=9.5
We simplify the equation to the form, which is simple to understand
.25(18-a)+8=9.5
Reorder the terms in parentheses
+(+4.5-0.25a)+8=9.5
Remove unnecessary parentheses
+4.5-0.25a+8=+9.5
We move all terms containing a to the left and all other terms to the right.
-0.25a=+9.5-4.5-8
We simplify left and right side of the equation.
-0.25a=-3
We divide both sides of the equation by -0.25 to get a.
a=12
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