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1.5+r/7.4=-2.5
We move all terms to the left:
1.5+r/7.4-(-2.5)=0
We add all the numbers together, and all the variables
r/7.4+4=0
We multiply all the terms by the denominator
r+4*7.4=0
We add all the numbers together, and all the variables
r+29.6=0
We move all terms containing r to the left, all other terms to the right
r=-29.6
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