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7(5x+3)=7(5x+3)
We move all terms to the left:
7(5x+3)-(7(5x+3))=0
We multiply parentheses
35x-(7(5x+3))+21=0
We calculate terms in parentheses: -(7(5x+3)), so:We get rid of parentheses
7(5x+3)
We multiply parentheses
35x+21
Back to the equation:
-(35x+21)
35x-35x-21+21=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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