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28=4(9x+7)
We move all terms to the left:
28-(4(9x+7))=0
We calculate terms in parentheses: -(4(9x+7)), so:We get rid of parentheses
4(9x+7)
We multiply parentheses
36x+28
Back to the equation:
-(36x+28)
-36x-28+28=0
We add all the numbers together, and all the variables
-36x=0
x=0/-36
x=0
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