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.15a+.75(300-a)=45(300)
We simplify the equation to the form, which is simple to understand
.15a+.75(300-a)=45(300)
Reorder the terms in parentheses
.15a+(+225-0.75a)=45*(300)
Remove unnecessary parentheses
+.15a+225-0.75a=+45+*(+300+)
Reorder the terms in parentheses
.15a+225-0.75a=+(+13500)
Remove unnecessary parentheses
+.15a+225-0.75a=+13500
We move all terms containing a to the left and all other terms to the right.
+ 0.15a-0.75a=+13500-225
We simplify left and right side of the equation.
-0.6a=+13275
We divide both sides of the equation by -0.6 to get a.
a=-22125
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