найдите корень уравнения:

1)(7х+9)-(11х-7)=8
2)19,6+у=7(1,2-у)
3)0,4(6-4у)=0,5(7-3у)-1.9

1)(7х+9)-(11х-7)=87x + 9 - 11x + 7 = 8-4x + 16 = 84x = 16 - 84x = 8x = 8 : 4x = 22)19,6+у=7(1,2-у)19,6 + y = 8,4 - 7y y + 7y = 8,4 - 19,68y = 11,2y = 11,2 : 8y = 1,43)0,4(6-4у)=0,5(7-3у)-1.92,4 - 1,6y = 3,5 - 1,5y - 1,92,4 - 1,6y = 1,6 - 1,5y1,6y - 1,5y = 2,4 - 1,60,1y = 0,8y = 0,8 : 0,1y = 8