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17.89+18.22-12.8t=-19.89-15.6t
We move all terms to the left:
17.89+18.22-12.8t-(-19.89-15.6t)=0
We add all the numbers together, and all the variables
-12.8t-(-15.6t-19.89)+17.89+18.22=0
We add all the numbers together, and all the variables
-12.8t-(-15.6t-19.89)+36.11=0
We get rid of parentheses
-12.8t+15.6t+19.89+36.11=0
We add all the numbers together, and all the variables
2.8t+56=0
We move all terms containing t to the left, all other terms to the right
2.8t=-56
t=-56/2.8
t=-20
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