Answer:
x = 18 degrees
Step-by-step explanation:
because lines n and m are parallel, 3x and 126 are same side interior angles. This means that when added up they equal 180, so make an equation as so:
3x + 126 = 180
Solve for it and x will equal 18.
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Brainly is good and educational for me.
So you would use GEMDAS or PEMDAS
-8-1+4x2
-8-1+8
-9+8
-1