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18-t/20=-9
We simplify the equation to the form, which is simple to understand
18-t/20=-9
Simplifying:
18-0.05t=-9
We move all terms containing t to the left and all other terms to the right.
-0.05t=-9-18
We simplify left and right side of the equation.
-0.05t=-27
We divide both sides of the equation by -0.05 to get t.
t=540
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