Question

7 x is equal to minus 21​

Answer 1

Answer:

You divide both sides by 7 to cancel out the 7 with the x. 21 divided by 7 is what? There you have it. You have the value of x. :)

Explanation:

For example:

x+9=12

Subtract 9 from both sides.

x=12−9

x=3

Now check by substituting 3 for x into the equation and solve.

3+9=12

12=12 Check!

Answer 2

Answer:

If X is variable then

x= -3

7(-3)= -21

If it is a sign of multiplying

then

7 must be multiply with-3 to produce-21