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7x=4x+81
We move all terms to the left:
7x-(4x+81)=0
We get rid of parentheses
7x-4x-81=0
We add all the numbers together, and all the variables
3x-81=0
We move all terms containing x to the left, all other terms to the right
3x=81
x=81/3
x=27
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