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3-9(x-4)=9x+21
We move all terms to the left:
3-9(x-4)-(9x+21)=0
We multiply parentheses
-9x-(9x+21)+36+3=0
We get rid of parentheses
-9x-9x-21+36+3=0
We add all the numbers together, and all the variables
-18x+18=0
We move all terms containing x to the left, all other terms to the right
-18x=-18
x=-18/-18
x=1
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