Solution
For this case we have the following equation given:
4r + 1.1 = 6.6r -3.84
We can subtract 4r in both sides and we got:
1.1 = 2.6r -3.84
Then we can add 3.84 in both sides and we got:
2.6 r = 4.94
And then the value of r we got:
[tex]r=\frac{4.94}{2.6}=1.9[/tex]