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15.50+1.50r=26
We move all terms to the left:
15.50+1.50r-(26)=0
We add all the numbers together, and all the variables
1.50r-10.5=0
We move all terms containing r to the left, all other terms to the right
1.50r=10.5
r=10.5/1.50
r=7
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