12=4(t-15)+-4

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Solution for 12=4(t-15)+-4 equation: 



12=4(t-15)+-4

We move all terms to the left:

12-(4(t-15)+-4)=0

We use the square of the difference formula

-(4(t-15)-4)+12=0



We calculate terms in parentheses: -(4(t-15)-4), so:

4(t-15)-4

We multiply parentheses

4t-60-4

We add all the numbers together, and all the variables

4t-64

Back to the equation:

-(4t-64)



We get rid of parentheses

-4t+64+12=0

We add all the numbers together, and all the variables

-4t+76=0

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

-4t=-76

t=-76/-4

t=+19

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