Select all the equations that have x=7 as a solution

x=7

Step-by-step explanation:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :  

x-(7)=0  

Step  1  :  Solving a Single Variable Equation

Solve  :    x-7 = 0  

Add  7  to both sides of the equation :  

x = 7  

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18