81-7x=11x+21

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Solution for 81-7x=11x+21 equation:


Simplifying
81 + -7x = 11x + 21

Reorder the terms:
81 + -7x = 21 + 11x

Solving
81 + -7x = 21 + 11x

Solving for variable 'x'.

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

Add '-11x' to each side of the equation.
81 + -7x + -11x = 21 + 11x + -11x

Combine like terms: -7x + -11x = -18x
81 + -18x = 21 + 11x + -11x

Combine like terms: 11x + -11x = 0
81 + -18x = 21 + 0
81 + -18x = 21

Add '-81' to each side of the equation.
81 + -81 + -18x = 21 + -81

Combine like terms: 81 + -81 = 0
0 + -18x = 21 + -81
-18x = 21 + -81

Combine like terms: 21 + -81 = -60
-18x = -60

Divide each side by '-18'.
x = 3.333333333

Simplifying
x = 3.333333333

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