9x-21=7x-3

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Solution for 9x-21=7x-3 equation:


Simplifying
9x + -21 = 7x + -3

Reorder the terms:
-21 + 9x = 7x + -3

Reorder the terms:
-21 + 9x = -3 + 7x

Solving
-21 + 9x = -3 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
-21 + 9x + -7x = -3 + 7x + -7x

Combine like terms: 9x + -7x = 2x
-21 + 2x = -3 + 7x + -7x

Combine like terms: 7x + -7x = 0
-21 + 2x = -3 + 0
-21 + 2x = -3

Add '21' to each side of the equation.
-21 + 21 + 2x = -3 + 21

Combine like terms: -21 + 21 = 0
0 + 2x = -3 + 21
2x = -3 + 21

Combine like terms: -3 + 21 = 18
2x = 18

Divide each side by '2'.
x = 9

Simplifying
x = 9

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