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3x+5x=72-x
We move all terms to the left:
3x+5x-(72-x)=0
We add all the numbers together, and all the variables
3x+5x-(-1x+72)=0
We add all the numbers together, and all the variables
8x-(-1x+72)=0
We get rid of parentheses
8x+1x-72=0
We add all the numbers together, and all the variables
9x-72=0
We move all terms containing x to the left, all other terms to the right
9x=72
x=72/9
x=8
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