( 4x + 15 ) + ( 8x + 45 ) = 180
12x + 60 = 180
12x = 180 - 60
12x = 120
x = 120/12
x = 10°
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Verified answer
( 4x + 15 ) + ( 8x + 45 ) = 180
12x + 60 = 180
12x = 180 - 60
12x = 120
x = 120/12
x = 10°