решите уравнения. дам 15 баллов и отмечу как лучший ответ!

5х - 9 = 3х + 12х = 10х = 5-2у + 14 = 8у - 6-10у = -20у = 2(у+8)(-7) = 14-7у - 56 = 14-7у = 70у = - 100,8х + 16 = 20 + 0,7х0,1х = 4х = 406(х-1) = 126х - 6 = 126х = 18х = 38,9х + 17,54 = 5,4х + 2,843,5х = -14,7х = -4,23/7 - 1/4х = 5 3/7 - 4х-5 = -15/4 х-5 = -3,75хх = - 5/3,754(3-х) - 11 = 7(2х-5)12 - 4х - 11 = 14х - 35-18х = - 12х = 1,51/4 - 1/3m = 4 1/4 - 3m4 = -2 2/3 mm = -2 2/3 ÷ 4m = - 1/3