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6.7=-0.4t-5.3
We move all terms to the left:
6.7-(-0.4t-5.3)=0
We get rid of parentheses
0.4t+5.3+6.7=0
We add all the numbers together, and all the variables
0.4t+12=0
We move all terms containing t to the left, all other terms to the right
0.4t=-12
t=-12/0.4
t=-30
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