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0.15t+0.85(10-t)=0.87(10)
We move all terms to the left:
0.15t+0.85(10-t)-(0.87(10))=0
We add all the numbers together, and all the variables
0.15t+0.85(-1t+10)-(0.871)=0
We add all the numbers together, and all the variables
0.15t+0.85(-1t+10)-0.871=0
We multiply parentheses
0.15t-0.85t+8.5-0.871=0
We add all the numbers together, and all the variables
-0.7t+7.629=0
We move all terms containing t to the left, all other terms to the right
-0.7t=-7.629
t=-7.629/-0.7
t=10+0.629/0.7
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