Find the measure of an angle that is 30 degrees less than its supplement. x = the angle 180  x = its supplement {supplementary angles add up to 180°} x = 180  x  30 {angle is 30° less than its supplement} x = 150  x {combined like terms} 2x = 150 {added x to each side} x = 75° {divided each side by 2} the angle is 75°  Algebra House
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