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77=13+4t
We move all terms to the left:
77-(13+4t)=0
We add all the numbers together, and all the variables
-(4t+13)+77=0
We get rid of parentheses
-4t-13+77=0
We add all the numbers together, and all the variables
-4t+64=0
We move all terms containing t to the left, all other terms to the right
-4t=-64
t=-64/-4
t=+16
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