.42t+21=-15

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Solution for .42t+21=-15 equation: 



.42t+21=-15

We move all terms to the left:

.42t+21-(-15)=0

We add all the numbers together, and all the variables

.42t+36=0

We move all terms containing t to the left, all other terms to the right

.42t=-36

t=-36/.42

t=-85+0.3/.42

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