5x+7x-21=105-9x

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Solution for 5x+7x-21=105-9x equation:


Simplifying
5x + 7x + -21 = 105 + -9x

Reorder the terms:
-21 + 5x + 7x = 105 + -9x

Combine like terms: 5x + 7x = 12x
-21 + 12x = 105 + -9x

Solving
-21 + 12x = 105 + -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 + 12x + 9x = 105 + -9x + 9x

Combine like terms: 12x + 9x = 21x
-21 + 21x = 105 + -9x + 9x

Combine like terms: -9x + 9x = 0
-21 + 21x = 105 + 0
-21 + 21x = 105

Add '21' to each side of the equation.
-21 + 21 + 21x = 105 + 21

Combine like terms: -21 + 21 = 0
0 + 21x = 105 + 21
21x = 105 + 21

Combine like terms: 105 + 21 = 126
21x = 126

Divide each side by '21'.
x = 6

Simplifying
x = 6

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