42=-3(t-4)

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Solution for 42=-3(t-4) equation: 



42=-3(t-4)

We move all terms to the left:

42-(-3(t-4))=0



We calculate terms in parentheses: -(-3(t-4)), so:

-3(t-4)

We multiply parentheses

-3t+12

Back to the equation:

-(-3t+12)



We get rid of parentheses

3t-12+42=0

We add all the numbers together, and all the variables

3t+30=0

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

3t=-30

t=-30/3

t=-10

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