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5.4=-t/15
We move all terms to the left:
5.4-(-t/15)=0
We get rid of parentheses
t/15+5.4=0
We multiply all the terms by the denominator
t+(5.4)*15=0
We add all the numbers together, and all the variables
t+81=0
We move all terms containing t to the left, all other terms to the right
t=-81
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