7x+21=4x-12

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Solution for 7x+21=4x-12 equation:


Simplifying
7x + 21 = 4x + -12

Reorder the terms:
21 + 7x = 4x + -12

Reorder the terms:
21 + 7x = -12 + 4x

Solving
21 + 7x = -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 + 7x + -4x = -12 + 4x + -4x

Combine like terms: 7x + -4x = 3x
21 + 3x = -12 + 4x + -4x

Combine like terms: 4x + -4x = 0
21 + 3x = -12 + 0
21 + 3x = -12

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

Combine like terms: 21 + -21 = 0
0 + 3x = -12 + -21
3x = -12 + -21

Combine like terms: -12 + -21 = -33
3x = -33

Divide each side by '3'.
x = -11

Simplifying
x = -11

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