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7x-4x+18=4x+9
We move all terms to the left:
7x-4x+18-(4x+9)=0
We add all the numbers together, and all the variables
3x-(4x+9)+18=0
We get rid of parentheses
3x-4x-9+18=0
We add all the numbers together, and all the variables
-1x+9=0
We move all terms containing x to the left, all other terms to the right
-x=-9
x=-9/-1
x=+9
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