We're given:
9x + 2x = 121
The first step is to group like terms on the left:
(9 + 2)x = 121
11x = 121
Now divide both sides by 11:
11x/11 = 121/11
x = 11
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it equals 13X.
-2x plus 3y equals 1
X=7
NM equals 2x + 1, as stated in the question!
2x-11