In a triangle, the sum of the angles is equal to 180. This allows us to write an equation to find x.
x+3x+25+(x-5)=180
Simplify this to get
5x+20=180
Subtract 20 from both sides to get:
5x=160
Divide both sides by 5 to get that x=32
Now we can plug this into angle G to find its measure.
3(32)+25
=96+25
=121
So angle G is equal to 121 degrees.
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