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0.09t + 0.12(100-t)=10.8
We simplify the equation to the form, which is simple to understand
0.09t + 0.12(100-t)=10.8
Reorder the terms in parentheses
0.09t+(+12-0.12t)=10.8
Remove unnecessary parentheses
+ 0.09t+12-0.12t=+10.8
We move all terms containing t to the left and all other terms to the right.
+ 0.09t-0.12t=+10.8-12
We simplify left and right side of the equation.
-0.03t=-1.2
We divide both sides of the equation by -0.03 to get t.
t=40
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