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-12t+13=4(-t-20)-19
We move all terms to the left:
-12t+13-(4(-t-20)-19)=0
We add all the numbers together, and all the variables
-12t-(4(-1t-20)-19)+13=0
We calculate terms in parentheses: -(4(-1t-20)-19), so:We get rid of parentheses
4(-1t-20)-19
We multiply parentheses
-4t-80-19
We add all the numbers together, and all the variables
-4t-99
Back to the equation:
-(-4t-99)
-12t+4t+99+13=0
We add all the numbers together, and all the variables
-8t+112=0
We move all terms containing t to the left, all other terms to the right
-8t=-112
t=-112/-8
t=+14
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