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