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20=309*99x
We move all terms to the left:
20-(309*99x)=0
We add all the numbers together, and all the variables
-(+309*99x)+20=0
We get rid of parentheses
-309*99x+20=0
Wy multiply elements
-30591x+20=0
We move all terms containing x to the left, all other terms to the right
-30591x=-20
x=-20/-30591
x=20/30591
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