1)12-4(x-3)=39-9x
2)2(3x+5)-3(4x-1)=11,8

спасибо))))))))))))))))))))))0

12 - 4*(x-3) = 39 - 9x12 - 4x + 12 = 39 - 9x24 - 4x = 39 - 9x -4x + 9x  = 39 - 245x = 15x= 3==========2 * (3x+ 5 ) - 3*(4x-1) = 11.86x + 10 - 12x + 3 = 11.8-6x + 13 = 11.8-6x = 11.8 - 13-6x = -1.2x = 0.2 

1)12-4(x-3)=39-9x12-4x+12=39-9x-4x+9x=39-12-125x=15x=15:5x=3====2)2(3x+5)-3(4x-1)=11,86x+10-12x+3=11,8-6x+13=11,86x=13-11,86x=1,2x=1,2:6x=0,2