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3969=0.07875x
We move all terms to the left:
3969-(0.07875x)=0
We add all the numbers together, and all the variables
-(+0.07875x)+3969=0
We get rid of parentheses
-0.07875x+3969=0
We move all terms containing x to the left, all other terms to the right
-0.07875x=-3969
x=-3969/-0.07875
x=+50400
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