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r=1-2/4
We move all terms to the left:
r-(1-2/4)=0
We add all the numbers together, and all the variables
r-(-2/4+1)=0
We get rid of parentheses
r-1+2/4=0
We multiply all the terms by the denominator
r*4+2-1*4=0
We add all the numbers together, and all the variables
r*4-2=0
Wy multiply elements
4r-2=0
We move all terms containing r to the left, all other terms to the right
4r=2
r=2/4
r=1/2
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