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12+11t=-20-5t
We move all terms to the left:
12+11t-(-20-5t)=0
We add all the numbers together, and all the variables
11t-(-5t-20)+12=0
We get rid of parentheses
11t+5t+20+12=0
We add all the numbers together, and all the variables
16t+32=0
We move all terms containing t to the left, all other terms to the right
16t=-32
t=-32/16
t=-2
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