21=7x+6-4x

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Solution for 21=7x+6-4x equation:


Simplifying
21 = 7x + 6 + -4x

Reorder the terms:
21 = 6 + 7x + -4x

Combine like terms: 7x + -4x = 3x
21 = 6 + 3x

Solving
21 = 6 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
21 + -3x = 6 + 3x + -3x

Combine like terms: 3x + -3x = 0
21 + -3x = 6 + 0
21 + -3x = 6

Add '-21' to each side of the equation.
21 + -21 + -3x = 6 + -21

Combine like terms: 21 + -21 = 0
0 + -3x = 6 + -21
-3x = 6 + -21

Combine like terms: 6 + -21 = -15
-3x = -15

Divide each side by '-3'.
x = 5

Simplifying
x = 5

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