81-3x=9-7x

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Solution for 81-3x=9-7x equation:


Simplifying
81 + -3x = 9 + -7x

Solving
81 + -3x = 9 + -7x

Solving for variable 'x'.

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

Add '7x' to each side of the equation.
81 + -3x + 7x = 9 + -7x + 7x

Combine like terms: -3x + 7x = 4x
81 + 4x = 9 + -7x + 7x

Combine like terms: -7x + 7x = 0
81 + 4x = 9 + 0
81 + 4x = 9

Add '-81' to each side of the equation.
81 + -81 + 4x = 9 + -81

Combine like terms: 81 + -81 = 0
0 + 4x = 9 + -81
4x = 9 + -81

Combine like terms: 9 + -81 = -72
4x = -72

Divide each side by '4'.
x = -18

Simplifying
x = -18

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