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(4t+4)+(8t-4)=90
We move all terms to the left:
(4t+4)+(8t-4)-(90)=0
We get rid of parentheses
4t+8t+4-4-90=0
We add all the numbers together, and all the variables
12t-90=0
We move all terms containing t to the left, all other terms to the right
12t=90
t=90/12
t=7+1/2
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