-21-2x=7-9x

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Solution for -21-2x=7-9x equation:


Simplifying
-21 + -2x = 7 + -9x

Solving
-21 + -2x = 7 + -9x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '9x' to each side of the equation.
-21 + -2x + 9x = 7 + -9x + 9x

Combine like terms: -2x + 9x = 7x
-21 + 7x = 7 + -9x + 9x

Combine like terms: -9x + 9x = 0
-21 + 7x = 7 + 0
-21 + 7x = 7

Add '21' to each side of the equation.
-21 + 21 + 7x = 7 + 21

Combine like terms: -21 + 21 = 0
0 + 7x = 7 + 21
7x = 7 + 21

Combine like terms: 7 + 21 = 28
7x = 28

Divide each side by '7'.
x = 4

Simplifying
x = 4

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