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2(x+3x)=8
We move all terms to the left:
2(x+3x)-(8)=0
We add all the numbers together, and all the variables
2(+4x)-8=0
We multiply parentheses
8x-8=0
We move all terms containing x to the left, all other terms to the right
8x=8
x=8/8
x=1
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