-10-2(2x-7)=-10-4x+14=-4x+4
-2(4+3x)+8x=-8-6x+8x=2x-8
28x-5(6x-0,2)=28x-30x+1=-2x+1
4x+(8-6x)=4x+8-6x=-2x+8
-13x-(4-9x)=-13x-4+9x=-4x-4
2(6+7x)-(12x+11)=12+14x-12x-11=2x+1
8x-(19x-6)+4(3x-1)=8x-19x+6+12x-4=x+2
#2
-0,14b+0,18b-0,23b+0,14b=-0,05b
b=-3,6
-3,6*(-0,05)=0,21
-0,05*6 2/3=-1/20*20/3=-1/3
#3
(0,4x+7)-4(0,8x-3)=2
0,4x+7-3,2x+12=2
-2,8x=2-12-7
-2,8x=-17:(-2,8)
x=170/28=85/14=6 1/14
4,5(7/15x+2/9)-0,77(8/11x-3/7)=-1,75
21/10x+1-56/100x+33/100=-1,75
2,1x-0,56x=-1,75-0,33-1
1,54x=-3,08:1,54
x=-2