Philip P. answered 09/21/14
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6r - 1 + 6r = 11
Add 1 to both sides:
6r + 6r = 12
Combine like terms:
12r = 12
Divide both sides by 12:
r = 1
Check:
6r - 1 + 6r = 11
Plug in r = 1:
6*(1) - 1 + 6*(1) = 11
6 - 1 + 6 = 11
5 + 6 = 11
11 = 11
Check!