7(2y-2)-2(3y-3,5)=9

7(2y-2)-2(3y-3,5)=9 14γ - 14 - 6γ + 7 = 9 8γ - 7 = 9 8γ = 16 γ = 16 / 8 γ = 2 проверка 7 (2 * 2 - 2) - 2(3 * 2 - 3,5) = 7 * 2 - 2 * 2,5 = 14 - 5 = 9

14у-14-6у+7=9

8у=9-7+14

8у=19

у=2