Respuesta :

[tex]-5-r=1+2r[/tex] 

[tex]-r=1+2r+5[/tex] 

[tex]-r=2r+6[/tex] 

[tex]-r-2r=6 [/tex] 

[tex]-3r=6[/tex]   [tex]|\text{Isolate r}[/tex]

[tex]r=-2[/tex]
r=-2 because you can add the 5 to the one and that cancels out the -5 on the left, now your equation is -r=6+2r so you can subtract the 2r from both sides and that leaves you with -3r=6 all there is to do now is divide by -3 on both sides
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