-81=-10(4+t)-1

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Solution for -81=-10(4+t)-1 equation: 



-81=-10(4+t)-1

We move all terms to the left:

-81-(-10(4+t)-1)=0

We add all the numbers together, and all the variables

-(-10(t+4)-1)-81=0



We calculate terms in parentheses: -(-10(t+4)-1), so:

-10(t+4)-1

We multiply parentheses

-10t-40-1

We add all the numbers together, and all the variables

-10t-41

Back to the equation:

-(-10t-41)



We get rid of parentheses

10t+41-81=0

We add all the numbers together, and all the variables

10t-40=0

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

10t=40

t=40/10

t=4

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