-20=-5(t-87)

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Solution for -20=-5(t-87) equation: 



-20=-5(t-87)

We move all terms to the left:

-20-(-5(t-87))=0



We calculate terms in parentheses: -(-5(t-87)), so:

-5(t-87)

We multiply parentheses

-5t+435

Back to the equation:

-(-5t+435)



We get rid of parentheses

5t-435-20=0

We add all the numbers together, and all the variables

5t-455=0

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

5t=455

t=455/5

t=91

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