4x-21=7x-9

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Solution for 4x-21=7x-9 equation:


Simplifying
4x + -21 = 7x + -9

Reorder the terms:
-21 + 4x = 7x + -9

Reorder the terms:
-21 + 4x = -9 + 7x

Solving
-21 + 4x = -9 + 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 + 4x + -7x = -9 + 7x + -7x

Combine like terms: 4x + -7x = -3x
-21 + -3x = -9 + 7x + -7x

Combine like terms: 7x + -7x = 0
-21 + -3x = -9 + 0
-21 + -3x = -9

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

Combine like terms: -21 + 21 = 0
0 + -3x = -9 + 21
-3x = -9 + 21

Combine like terms: -9 + 21 = 12
-3x = 12

Divide each side by '-3'.
x = -4

Simplifying
x = -4

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