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(t+19)+(9t-11)+(t+18)=180
We move all terms to the left:
(t+19)+(9t-11)+(t+18)-(180)=0
We get rid of parentheses
t+9t+t+19-11+18-180=0
We add all the numbers together, and all the variables
11t-154=0
We move all terms containing t to the left, all other terms to the right
11t=154
t=154/11
t=14
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