Номер 11
1) 4(x-3)=x+6; 4x-12=x+6;
4x-x=6+12; 3x=18; x=6.
2) 4-6(x+2)=3-5x; 4-6x-12=3-5x; -8-6x=3-5x; -6x+5x=3+8; -x=11; x=-11.
3)(5x+8)-(8x+14)=9; 5x+8-8x-14=9; -3x-6=9; -3x=9+6; -3x=15; x=-5.
4) 2,7+3y=9(y-2,1); 2,7+3y=9y-18,9; 3y-9y=-18,9-2,7; -6y=-21,6; y=3,6.
5) 0,3(8-3y)=3,2-0,8(y-7); 2,4-0,9y= 3,2-0,8y+5,6; 2,4-0,9y=8,8-0,8y; -0,9y+0,8y=8,8-2,4; -0.1y= 6,4; y=-64.
6)5/6*(1/3x-1/5)=3x+3 1/3; 5/18*(-1/6)=3x+10/3; 5x-3=54x+60; 5x-54x=60+3; -49x=63; x=-9/7