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85=3t-(-13)
We move all terms to the left:
85-(3t-(-13))=0
We calculate terms in parentheses: -(3t-(-13)), so:We get rid of parentheses
3t-(-13)
We add all the numbers together, and all the variables
3t+13
Back to the equation:
-(3t+13)
-3t-13+85=0
We add all the numbers together, and all the variables
-3t+72=0
We move all terms containing t to the left, all other terms to the right
-3t=-72
t=-72/-3
t=+24
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