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875=12000*4r
We move all terms to the left:
875-(12000*4r)=0
We add all the numbers together, and all the variables
-(+12000*4r)+875=0
We get rid of parentheses
-12000*4r+875=0
Wy multiply elements
-48000r+875=0
We move all terms containing r to the left, all other terms to the right
-48000r=-875
r=-875/-48000
r=7/384
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