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20=5(3-t/7)
We move all terms to the left:
20-(5(3-t/7))=0
We add all the numbers together, and all the variables
-(5(-t/7+3))+20=0
We multiply all the terms by the denominator
-(5(-t+20*7+3))=0
We calculate terms in parentheses: -(5(-t+20*7+3)), so:We get rid of parentheses
5(-t+20*7+3)
We add all the numbers together, and all the variables
5(-1t+143)
We multiply parentheses
-5t+715
Back to the equation:
-(-5t+715)
5t-715=0
We move all terms containing t to the left, all other terms to the right
5t=715
t=715/5
t=143
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