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30+4x=6x-20
We move all terms to the left:
30+4x-(6x-20)=0
We get rid of parentheses
4x-6x+20+30=0
We add all the numbers together, and all the variables
-2x+50=0
We move all terms containing x to the left, all other terms to the right
-2x=-50
x=-50/-2
x=+25
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