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30+4x=2x-4
We move all terms to the left:
30+4x-(2x-4)=0
We get rid of parentheses
4x-2x+4+30=0
We add all the numbers together, and all the variables
2x+34=0
We move all terms containing x to the left, all other terms to the right
2x=-34
x=-34/2
x=-17
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