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ak47alex
so on number 2 u can put 7x-3 equals -21
and on number 3 u can put that you need to subtract the 7 from both sides so thats where you get -3 on the left side and on number 4 you can put that you need to divide by negative 3 to get the answer which is 7
carlosego

In step 2 multiply what is inside the parenthesis by 7 (distributive property):

7 * x = 7x

7 * 3 = 21

In step 3 subtract -7x on both sides of the equation.  (Property of subtraction of equality)

Then -7x + 4x = -3x

7x-7x + 21 = 21


In step 4, both sides of the equation are divided by -3.  (owned by the equality division)

So:

-3x / -3 = x

-21 / -3 = 7

Recall that the division of equal signs results in a positive number.

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