X = -3
Pull out the like terms: -7x - 21 = -7 × ( x + 3)
Solve: -7 = 0
Solve: x + 3 = 0
Subtract 3 from both sides of the equation
So, x = -3
Answer:
29
Step-by-step explanation:
As it is a list of prime number, the sequence continues with 29 being the next prime number after 23.
The first cube is 12, the second one is 10. Just do length times width times height.
You can make a proportion of 8/20 to 42/x and then simply cross multiply from there to solve for y
