21+4x=9+7x

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Solution for 21+4x=9+7x equation:


Simplifying
21 + 4x = 9 + 7x

Solving
21 + 4x = 9 + 7x

Solving for variable 'x'.

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

Add '-7x' to each side of the equation.
21 + 4x + -7x = 9 + 7x + -7x

Combine like terms: 4x + -7x = -3x
21 + -3x = 9 + 7x + -7x

Combine like terms: 7x + -7x = 0
21 + -3x = 9 + 0
21 + -3x = 9

Add '-21' to each side of the equation.
21 + -21 + -3x = 9 + -21

Combine like terms: 21 + -21 = 0
0 + -3x = 9 + -21
-3x = 9 + -21

Combine like terms: 9 + -21 = -12
-3x = -12

Divide each side by '-3'.
x = 4

Simplifying
x = 4

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