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30=4x+9
We move all terms to the left:
30-(4x+9)=0
We get rid of parentheses
-4x-9+30=0
We add all the numbers together, and all the variables
-4x+21=0
We move all terms containing x to the left, all other terms to the right
-4x=-21
x=-21/-4
x=5+1/4
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