117.
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X - 4 = 9 add 4 to each side X = 13 check 13 - 4 = 9 9 = 9
-9-2x+x = -13 -2x+x = -13+9 -x = -4 x = 4
1) x+9=13 (subtract 9) x=4 2) x+9=13 (divide by 9) x/9+1=13/9 (use Pascals theorem of 1) (x+4)/2=4 x+4=8 x=4
22-9=13
13 x 9 = 117