21=5+7x+9x

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


Simplifying
21 = 5 + 7x + 9x

Combine like terms: 7x + 9x = 16x
21 = 5 + 16x

Solving
21 = 5 + 16x

Solving for variable 'x'.

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

Add '-16x' to each side of the equation.
21 + -16x = 5 + 16x + -16x

Combine like terms: 16x + -16x = 0
21 + -16x = 5 + 0
21 + -16x = 5

Add '-21' to each side of the equation.
21 + -21 + -16x = 5 + -21

Combine like terms: 21 + -21 = 0
0 + -16x = 5 + -21
-16x = 5 + -21

Combine like terms: 5 + -21 = -16
-16x = -16

Divide each side by '-16'.
x = 1

Simplifying
x = 1

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