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x=720-4x
We move all terms to the left:
x-(720-4x)=0
We add all the numbers together, and all the variables
x-(-4x+720)=0
We get rid of parentheses
x+4x-720=0
We add all the numbers together, and all the variables
5x-720=0
We move all terms containing x to the left, all other terms to the right
5x=720
x=720/5
x=144
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