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-7.9t=-2.13-8.2t
We move all terms to the left:
-7.9t-(-2.13-8.2t)=0
We add all the numbers together, and all the variables
-7.9t-(-8.2t-2.13)=0
We get rid of parentheses
-7.9t+8.2t+2.13=0
We add all the numbers together, and all the variables
0.3t+2.13=0
We move all terms containing t to the left, all other terms to the right
0.3t=-2.13
t=-2.13/0.3
t=-7+0.03/0.3
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