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2x+8+4x=30+20
We move all terms to the left:
2x+8+4x-(30+20)=0
We add all the numbers together, and all the variables
2x+4x+8-50=0
We add all the numbers together, and all the variables
6x-42=0
We move all terms containing x to the left, all other terms to the right
6x=42
x=42/6
x=7
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