[27x11-(x+12)x8]x3-79}:5=100
[297 -(x+12)x8]x3-79 =100x5
[297 -(x+12)x8]x3-79 =500
[297 -(x+12)x8]x3 =500+79
[297 -(x+12)x8]x3 =579
297 -(x+12)x8 =579:3
297 -(x+12)x8 =193
(x+12)x8 =297-193
(x+12)x8 =104
x+12 =104:8
x+12 =13
x =13-12
x =1
3 2 / 5 + 4 3 / 7 - 1 / 4 + 44 / 77 - 2 2 / 5 - 0,75
= 17 / 5 + 31 / 7 - 1 / 4 + 4 / 7 - 12 / 5 - 3 / 4
= ( 17 / 5 - 12 / 5 ) + ( 31 / 7 - 4 / 7 ) + ( 1 / 4 + 3 / 4 )
= 1 + 9 + 1
= 11