21-7x=-9x-13

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


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

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

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

Solving for variable 'x'.

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

Add '9x' to each side of the equation.
21 + -7x + 9x = -13 + -9x + 9x

Combine like terms: -7x + 9x = 2x
21 + 2x = -13 + -9x + 9x

Combine like terms: -9x + 9x = 0
21 + 2x = -13 + 0
21 + 2x = -13

Add '-21' to each side of the equation.
21 + -21 + 2x = -13 + -21

Combine like terms: 21 + -21 = 0
0 + 2x = -13 + -21
2x = -13 + -21

Combine like terms: -13 + -21 = -34
2x = -34

Divide each side by '2'.
x = -17

Simplifying
x = -17

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