Решите примеры и два уравнения в конце. 4*(x-y*10); 11(2-a-b); 7(m+4-n); 7x+5x=60 8x-4x+18x=88

4 * (x - y * 10) = 4 * (х - 10у) = 4 * х - 10у * 4 = 4х - 40у; 

11 * (2 - a - b) = 11 * 2 - а * 11 - b - 11 = 22 - 11а - 11b;

7 * (m + 4 - n) = 7 * m + 4 * 7 - n * 7 = 7m + 28 - 7n;

7x + 5x = 60;

12х = 60;

х = 60 : 12;

х = 5;

7 * 5 + 5 * 5 = 60;

35 + 25 = 60;

60 = 60;

8x - 4x + 18x = 88;

4х + 18х = 88;

22х = 88;

х = 88 : 22;

х = 4;

8 * 4 - 4 * 4 + 18 * 4 = 88;

32 - 16 + 72 = 88;

16 + 72 = 88;

88 = 88.