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(2t-4)+(5t+2)=90
We move all terms to the left:
(2t-4)+(5t+2)-(90)=0
We get rid of parentheses
2t+5t-4+2-90=0
We add all the numbers together, and all the variables
7t-92=0
We move all terms containing t to the left, all other terms to the right
7t=92
t=92/7
t=13+1/7
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