(1-z) can combine with other coupons
Answer:
x
=
26
Step-by-step explanation:
Isolate the variable by dividing each side by factors that don't contain the variable.
Answer:
Step-by-step explanation:
Answer:
x = 10
Step-by-step explanation:
3x - 9 = 21
add 9 on both sides:
⇒ 3x - 9 + 9 = 21 + 9
⇒ 3x = 30
divide 3 on both sides:
⇒ 
⇒ x = 10
to check answer, substitute x by 10 on the original equation:
⇒ 3x - 9 = 21
⇒ 3 x 10 - 9 = 21
⇒30 - 9 = 21
⇒ 21 = 21
The numbers are: n, (n+2) and (n+4);
we can suggest this inequation:
84<n+(n+2)+(n+4)<96
Now, we solve this inequation:
84<n+(n+2)+(n+4)<96
84<3n+6<96
1)
3n+6>84
3n+6-6>84-6
3n>78
3n/3>78/3
n>26
2)
3n+6<96
3n+6-6<96-6
3n<90
3n/3<90/3
n<30
The solution is:
26<n<30
Then: n=28
The numbers will be: 28,30 and 32.
