7x=4x-21

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Solution for 7x=4x-21 equation: 


Simplifying
7x = 4x + -21

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

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

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

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

Divide each side by '3'.
x = -7

Simplifying
x = -7

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