3x-21=4x-12

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Solution for 3x-21=4x-12 equation:


Simplifying
3x + -21 = 4x + -12

Reorder the terms:
-21 + 3x = 4x + -12

Reorder the terms:
-21 + 3x = -12 + 4x

Solving
-21 + 3x = -12 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
-21 + 3x + -4x = -12 + 4x + -4x

Combine like terms: 3x + -4x = -1x
-21 + -1x = -12 + 4x + -4x

Combine like terms: 4x + -4x = 0
-21 + -1x = -12 + 0
-21 + -1x = -12

Add '21' to each side of the equation.
-21 + 21 + -1x = -12 + 21

Combine like terms: -21 + 21 = 0
0 + -1x = -12 + 21
-1x = -12 + 21

Combine like terms: -12 + 21 = 9
-1x = 9

Divide each side by '-1'.
x = -9

Simplifying
x = -9

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