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50=28.10+0.15t
We move all terms to the left:
50-(28.10+0.15t)=0
We add all the numbers together, and all the variables
-(0.15t+28.1)+50=0
We get rid of parentheses
-0.15t-28.1+50=0
We add all the numbers together, and all the variables
-0.15t+21.9=0
We move all terms containing t to the left, all other terms to the right
-0.15t=-21.9
t=-21.9/-0.15
t=+146
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