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4x+2x+x=3x-7
We move all terms to the left:
4x+2x+x-(3x-7)=0
We add all the numbers together, and all the variables
7x-(3x-7)=0
We get rid of parentheses
7x-3x+7=0
We add all the numbers together, and all the variables
4x+7=0
We move all terms containing x to the left, all other terms to the right
4x=-7
x=-7/4
x=-1+3/4
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