because the sum of the angles MRN and NRT equal angle MRT, the equation to solve for g would by 2g-2 + 4g -9 = 133
2g-2+4g-9 = 133
combine like terms
6g - 11 = 133
add 11 to both sides
6g = 122
divide both sides by 6
g=122
Now that you know what g is, you can plug it into the equation 2g -2 which would be 46