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.25t+.75(10-t)=0.81(10)
We move all terms to the left:
.25t+.75(10-t)-(0.81(10))=0
We add all the numbers together, and all the variables
.25t+.75(-1t+10)-(0.811)=0
We add all the numbers together, and all the variables
.25t+.75(-1t+10)-0.811=0
We multiply parentheses
.25t-0.75t+7.5-0.811=0
We add all the numbers together, and all the variables
-0.5t+6.689=0
We move all terms containing t to the left, all other terms to the right
-0.5t=-6.689
t=-6.689/-0.5
t=13+0.189/0.5
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