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b.3z+11=28 3z=28-11 3z=17 z=17/3 z=5,67
c.25-4y=6y+15 25-15=6y+4y 10=10y y=1
d.-4x-15=1-8x -4x+8x=1+15 4x=16 x=4
e.6/a + 2 =4 6/a=4-2 6/a =2 2a=6 a=3
m=12/24
m=1/2
2.3z+11=-28
3z=-28-11
3z=-39
z=-39/-3
z=13
3.25-4y=6y+15
25-15=6y+4y
10=10y
y=10/10
y=1
4.-4x-15=1-8x
-4x+8x=15+1
4x=16
x=16/4
x=4
5. 6/a+2=4
6/a=4-2
6/a=2
a=2×6
a=12