1)
3(x-7y+2b)=3x-21y+6b
2)
6x-1.2=0
6x=1.2
x=0.2
3)
A)
x+9=4x+3
x-4x=-9+3
-3x=-6
x=2
Б)
12-0.8x=26+0.6x
0.6x+0.8x=-26+12
1.4x=-14
x=-10
4.
(1.3a-4)-(6+2.7a)=1.3a-4-6-2.7a=-1.4a-10
1)
3(x-7y+2b)=3x-21y+6b
2)
6x-1.2=0
6x=1.2
x=0.2
3)
A)
x+9=4x+3
x-4x=-9+3
-3x=-6
x=2
Б)
12-0.8x=26+0.6x
0.6x+0.8x=-26+12
1.4x=-14
x=-10
4.
(1.3a-4)-(6+2.7a)=1.3a-4-6-2.7a=-1.4a-10