x + (x+88) + (x-13) = 180 degrees
x+x+88+x-13 = 180 degrees
x+x+x+88-13 = 180 degrees
3x+75=180 ==> 3x = 105 ==> x = 35 degrees
P = x-13 = 22 degrees
Incase you're asked about Q it's x+88 = 35+88 = 123 degrees
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