7x-21=9x-45

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Solution for 7x-21=9x-45 equation:


Simplifying
7x + -21 = 9x + -45

Reorder the terms:
-21 + 7x = 9x + -45

Reorder the terms:
-21 + 7x = -45 + 9x

Solving
-21 + 7x = -45 + 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 + 7x + -9x = -45 + 9x + -9x

Combine like terms: 7x + -9x = -2x
-21 + -2x = -45 + 9x + -9x

Combine like terms: 9x + -9x = 0
-21 + -2x = -45 + 0
-21 + -2x = -45

Add '21' to each side of the equation.
-21 + 21 + -2x = -45 + 21

Combine like terms: -21 + 21 = 0
0 + -2x = -45 + 21
-2x = -45 + 21

Combine like terms: -45 + 21 = -24
-2x = -24

Divide each side by '-2'.
x = 12

Simplifying
x = 12

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