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72-x=6x+51
We move all terms to the left:
72-x-(6x+51)=0
We add all the numbers together, and all the variables
-1x-(6x+51)+72=0
We get rid of parentheses
-1x-6x-51+72=0
We add all the numbers together, and all the variables
-7x+21=0
We move all terms containing x to the left, all other terms to the right
-7x=-21
x=-21/-7
x=+3
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