∠1 and angle, 2∠2 are supplementary angles. If m, angle, 1, equals, left bracket, 3, x, minus, 10, right bracket, degreesm∠1=(3x−10)
∘
and m, angle, 2, equals, left bracket, 8, x, minus, 19, right bracket, degreesm∠2=(8x−19)
∘
, then find the measure of angle, 1∠1.