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4x-30=2x-4
We move all terms to the left:
4x-30-(2x-4)=0
We get rid of parentheses
4x-2x+4-30=0
We add all the numbers together, and all the variables
2x-26=0
We move all terms containing x to the left, all other terms to the right
2x=26
x=26/2
x=13
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