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4(x*9)=72
We move all terms to the left:
4(x*9)-(72)=0
We add all the numbers together, and all the variables
4(+x*9)-72=0
We multiply parentheses
36x-72=0
We move all terms containing x to the left, all other terms to the right
36x=72
x=72/36
x=2
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