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21=4t-11
We move all terms to the left:
21-(4t-11)=0
We get rid of parentheses
-4t+11+21=0
We add all the numbers together, and all the variables
-4t+32=0
We move all terms containing t to the left, all other terms to the right
-4t=-32
t=-32/-4
t=+8
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