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t+5=-4t-15
We move all terms to the left:
t+5-(-4t-15)=0
We get rid of parentheses
t+4t+15+5=0
We add all the numbers together, and all the variables
5t+20=0
We move all terms containing t to the left, all other terms to the right
5t=-20
t=-20/5
t=-4
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