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The two angles are same-side angles, which means they add up to 180°. Make an equation where they equal 180.

x + 48 = 180
Subtract 48 from both sides.

x = 132
check the picture below.

now, the x°  and the 48° are both linear angles, and therefore they add up to 180°, thus

x° + 48° = 180°
x° = 180° - 48°
Ver imagen jdoe0001

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