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(-2t-56)-(-9t+43)=524
We move all terms to the left:
(-2t-56)-(-9t+43)-(524)=0
We get rid of parentheses
-2t+9t-56-43-524=0
We add all the numbers together, and all the variables
7t-623=0
We move all terms containing t to the left, all other terms to the right
7t=623
t=623/7
t=89
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