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72x=450-20x
We move all terms to the left:
72x-(450-20x)=0
We add all the numbers together, and all the variables
72x-(-20x+450)=0
We get rid of parentheses
72x+20x-450=0
We add all the numbers together, and all the variables
92x-450=0
We move all terms containing x to the left, all other terms to the right
92x=450
x=450/92
x=4+41/46
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