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87=t/8+78
We move all terms to the left:
87-(t/8+78)=0
We get rid of parentheses
-t/8-78+87=0
We multiply all the terms by the denominator
-t-78*8+87*8=0
We add all the numbers together, and all the variables
-1t+72=0
We move all terms containing t to the left, all other terms to the right
-t=-72
t=-72/-1
t=+72
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