21=4x+3-2x

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Solution for 21=4x+3-2x equation:


Simplifying
21 = 4x + 3 + -2x

Reorder the terms:
21 = 3 + 4x + -2x

Combine like terms: 4x + -2x = 2x
21 = 3 + 2x

Solving
21 = 3 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
21 + -2x = 3 + 2x + -2x

Combine like terms: 2x + -2x = 0
21 + -2x = 3 + 0
21 + -2x = 3

Add '-21' to each side of the equation.
21 + -21 + -2x = 3 + -21

Combine like terms: 21 + -21 = 0
0 + -2x = 3 + -21
-2x = 3 + -21

Combine like terms: 3 + -21 = -18
-2x = -18

Divide each side by '-2'.
x = 9

Simplifying
x = 9

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