Решите хотябы один!
1. (x+3y)-((5y-6x)+7)-(9x+8y-12)
2. -(7p-8q)+(-9p-(4q+9))-(9q-(8+14p))-(5p-11q)
3. 4s+2(3t-(3r-6s))-(5s-3(s-4(t-2r)))+2(4t+2r-2(3t+5s))