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16.2=-4.2t+15
We move all terms to the left:
16.2-(-4.2t+15)=0
We get rid of parentheses
4.2t-15+16.2=0
We add all the numbers together, and all the variables
4.2t+1.2=0
We move all terms containing t to the left, all other terms to the right
4.2t=-1.2
t=-1.2/4.2
t=-1/3.5
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