21=4x-3x

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Solution for 21=4x-3x equation:


Simplifying
21 = 4x + -3x

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

Solving
21 = 1x

Solving for variable 'x'.

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

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

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

Add '-21' to each side of the equation.
21 + -21 + -1x = 0 + -21

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

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

Divide each side by '-1'.
x = 21

Simplifying
x = 21

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