3/4x+0,24=2/7x-1,06
3/4x-2/7x=-1,06-0,24
13/28x=-1,3
x=-1,3:13/28
x=-13/10*28/13
x=-2 4/5
========================
2/11x+5/14=0,45x+1,2
2/11x-0,45x=1,2-5/14
2/11x-45/100x=12/10-5/14
-59/220x=59/70
x=59/70*(-220/59)
x=-3 1/7
===============================
2/35-2,9x=0,8x-3/14
-2,9x-0,8x=-3/14-2/35
-3,7x=-19/70
x=-19/70:(-37/10)
x=-19/70*(-10/37)
x=19/259
==============================
-0,21x-15/56=3/16+257/800x
-0,21x-257/800x=3/16+15/56
-17/32x=51/112
x=51/112*(-32/17)
x=-6/7