Answers:
7. )4(3x - 2) = 9z-7
Multiply the bracket by 4
(4)(3x)=12x , (4)(-2)=-8
12x-8=9z-7
move 8 to the other side
sign changes from -8 to +8
12x-8+8=9z-7+8
12x=9z+1
divide both sides by 12
12x/12=9z/12+1/12
reduce 9z/12 by dividing by 3
9z/3=3
12/3=4
x=3/4z+1/12
8. ) 7s+2=4(s+1)
Multiply the bracket by 4
(4)(s)=4s , (4)(1)=4
7s+2=4s+4
7s-4s+2=4s-4s+4
3s+2=4
3s+2-2=4-2
3s=2
divide both sides by 3
3s/3=2/3
s=2/3
9). 2/3(3q + 6) = 8
(2/3)(3q)
Cross out 3 and 3q divide by 3 and then becomes 2q
2/3*6 - Cross out 3 and 6, divide by 3 and then becomes 4
2q+4=8
2q+4-4=8-4
2q=4
divide both sides by 2
2q/2=4/2
q=2
