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9(x-4)+21=9x-15
We move all terms to the left:
9(x-4)+21-(9x-15)=0
We multiply parentheses
9x-(9x-15)-36+21=0
We get rid of parentheses
9x-9x+15-36+21=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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