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78=6t+7t
We move all terms to the left:
78-(6t+7t)=0
We add all the numbers together, and all the variables
-(+13t)+78=0
We get rid of parentheses
-13t+78=0
We move all terms containing t to the left, all other terms to the right
-13t=-78
t=-78/-13
t=+6
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