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10(9-t)=10-9t
We move all terms to the left:
10(9-t)-(10-9t)=0
We add all the numbers together, and all the variables
10(-1t+9)-(-9t+10)=0
We multiply parentheses
-10t-(-9t+10)+90=0
We get rid of parentheses
-10t+9t-10+90=0
We add all the numbers together, and all the variables
-1t+80=0
We move all terms containing t to the left, all other terms to the right
-t=-80
t=-80/-1
t=+80
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