7x-4x+21=6

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


Simplifying
7x + -4x + 21 = 6

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

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

Solving
21 + 3x = 6

Solving for variable 'x'.

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

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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