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