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3969=0.105*0.75x
We move all terms to the left:
3969-(0.105*0.75x)=0
We add all the numbers together, and all the variables
-(+0.105*0.75x)+3969=0
We get rid of parentheses
-0.105*0.75x+3969=0
We move all terms containing x to the left, all other terms to the right
-0.105*0.75x=-3969
x=-3969/1
x=-3969
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