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4(r+1/2)=12
We move all terms to the left:
4(r+1/2)-(12)=0
We add all the numbers together, and all the variables
4(+r+1/2)-12=0
We multiply parentheses
4r-12+1/2*4=0
We multiply all the terms by the denominator
4r*2*4+1-12*2*4=0
We add all the numbers together, and all the variables
4r*2*4-95=0
Wy multiply elements
32r*4-95=0
Wy multiply elements
128r-95=0
We move all terms containing r to the left, all other terms to the right
128r=95
r=95/128
r=95/128
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