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4x-30=x-3
We move all terms to the left:
4x-30-(x-3)=0
We get rid of parentheses
4x-x+3-30=0
We add all the numbers together, and all the variables
3x-27=0
We move all terms containing x to the left, all other terms to the right
3x=27
x=27/3
x=9
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