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-40=4t+20
We move all terms to the left:
-40-(4t+20)=0
We get rid of parentheses
-4t-20-40=0
We add all the numbers together, and all the variables
-4t-60=0
We move all terms containing t to the left, all other terms to the right
-4t=60
t=60/-4
t=-15
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