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644=7(t-811)
We move all terms to the left:
644-(7(t-811))=0
We calculate terms in parentheses: -(7(t-811)), so:We get rid of parentheses
7(t-811)
We multiply parentheses
7t-5677
Back to the equation:
-(7t-5677)
-7t+5677+644=0
We add all the numbers together, and all the variables
-7t+6321=0
We move all terms containing t to the left, all other terms to the right
-7t=-6321
t=-6321/-7
t=+903
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