1)
3(4a - 3) = 7 a + 16
12a-9=7a+16
12a-7a=16+9
5a=25
a=25:5
a=5
=======
2)
2(x + 6) - 3(2x - 7) = 29
2x+12-6x+21=29
-4x+33=29
4x=33-29
4x=4
x=1
=======
3)
4(3u + 5 ) = 8u + 14
12u+20=8u+14
12u-8u=14-20
4u=-6
u=-6:4
u=-1,5
=========
4)
4 - 5y = 6(3 - 2y)
4-5y=18-12y
-5y+12y=18-4
7y=14
y=14:7
y=2
========
5)
4s - 27 = 7(s - 4)
4s-27=7s-28
7s-4s=-27+28
3s=1
s=1/3
=====
6)
8(5 - 3z) = 29 - 22z
40-24z=29-22z
-22z+24z=40-29
2z=11
z=11:2
z=5,5
==========
7)
5( 8 - 5b) - 6(4 - 3b) = 16
40-25b-24+18b=16
16-7b=16
-7b=16-16
-7b=0
b=0