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4.9(1.9r-1.2)=16
We move all terms to the left:
4.9(1.9r-1.2)-(16)=0
We multiply parentheses
4.9r-5.88-16=0
We add all the numbers together, and all the variables
4.9r-21.88=0
We move all terms containing r to the left, all other terms to the right
4.9r=21.88
r=21.88/4.9
r=4+1/2.14912280702
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