How would you find the missing angle with this setup: a 180 degree line with a right angle coming out, then another right angle forming two angles, one angle is x and the other is x16. I need to use an algebraic expression to find x. x + x  16 = 90 {the two angles add up to 90 degrees} 2x  16 = 90 {combined like terms} 2x = 106 {added 16 to both sides} x = 53 {divided both sides by 2} x  16 = 37 missing angles are 53 and 37  Algebra House
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