Answer:
x = 23
Step-by-step explanation:
Seeing same-side exterior angles theoreom,
both of these angles add up to 180°.
Looking at this,
3x + (4x+19) = 180
3x + 4x + 19 = 180
Subtracting both sides by 19 to get x on the LHS:
3x + 4x + 19 - 19 = 180 - 19
7x = 161
x = 23
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