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0.9(x-20)=72
We move all terms to the left:
0.9(x-20)-(72)=0
We multiply parentheses
0.9x-18-72=0
We add all the numbers together, and all the variables
0.9x-90=0
We move all terms containing x to the left, all other terms to the right
0.9x=90
x=90/0.9
x=100
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