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2(5t+5)=90
We move all terms to the left:
2(5t+5)-(90)=0
We multiply parentheses
10t+10-90=0
We add all the numbers together, and all the variables
10t-80=0
We move all terms containing t to the left, all other terms to the right
10t=80
t=80/10
t=8
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