9=7x-13x-21

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Solution for 9=7x-13x-21 equation:


Simplifying
9 = 7x + -13x + -21

Reorder the terms:
9 = -21 + 7x + -13x

Combine like terms: 7x + -13x = -6x
9 = -21 + -6x

Solving
9 = -21 + -6x

Solving for variable 'x'.

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

Add '6x' to each side of the equation.
9 + 6x = -21 + -6x + 6x

Combine like terms: -6x + 6x = 0
9 + 6x = -21 + 0
9 + 6x = -21

Add '-9' to each side of the equation.
9 + -9 + 6x = -21 + -9

Combine like terms: 9 + -9 = 0
0 + 6x = -21 + -9
6x = -21 + -9

Combine like terms: -21 + -9 = -30
6x = -30

Divide each side by '6'.
x = -5

Simplifying
x = -5

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