81=7x+2x+9

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Solution for 81=7x+2x+9 equation:


Simplifying
81 = 7x + 2x + 9

Reorder the terms:
81 = 9 + 7x + 2x

Combine like terms: 7x + 2x = 9x
81 = 9 + 9x

Solving
81 = 9 + 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.
81 + -9x = 9 + 9x + -9x

Combine like terms: 9x + -9x = 0
81 + -9x = 9 + 0
81 + -9x = 9

Add '-81' to each side of the equation.
81 + -81 + -9x = 9 + -81

Combine like terms: 81 + -81 = 0
0 + -9x = 9 + -81
-9x = 9 + -81

Combine like terms: 9 + -81 = -72
-9x = -72

Divide each side by '-9'.
x = 8

Simplifying
x = 8

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