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7t=7(4t+3)
We move all terms to the left:
7t-(7(4t+3))=0
We calculate terms in parentheses: -(7(4t+3)), so:We get rid of parentheses
7(4t+3)
We multiply parentheses
28t+21
Back to the equation:
-(28t+21)
7t-28t-21=0
We add all the numbers together, and all the variables
-21t-21=0
We move all terms containing t to the left, all other terms to the right
-21t=21
t=21/-21
t=-1
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