1/3x+1/5x+1/6x=21/40 1/4x+1/6x+1/8x=39/56
помогите пожалуста

1 не правильно мы всё решили

1/3х + 1/5х + 1/6х = 21/4010/30х + 6/30х + 5/30х = 21/4021/30х = 21/407/10х = 21/4028/40х = 21/40х = 21/40 : 28/40х = 21/40 * 40/28х = 21/281/4х + 1/6х + 1/8х = 39/566/24х + 4/24х + 3/8х = 39/5613/24х = 39/56х = 39/56 : 13/24х = 39/56 * 24/13х = (3 * 24)/56х = 72/56 = 9/7 = 1 2/7