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0=91-20x
We move all terms to the left:
0-(91-20x)=0
We add all the numbers together, and all the variables
-(-20x+91)+0=0
We add all the numbers together, and all the variables
-(-20x+91)=0
We get rid of parentheses
20x-91=0
We move all terms containing x to the left, all other terms to the right
20x=91
x=91/20
x=4+11/20
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