7x+9=-x+81

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


Simplifying
7x + 9 = -1x + 81

Reorder the terms:
9 + 7x = -1x + 81

Reorder the terms:
9 + 7x = 81 + -1x

Solving
9 + 7x = 81 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
9 + 7x + x = 81 + -1x + x

Combine like terms: 7x + x = 8x
9 + 8x = 81 + -1x + x

Combine like terms: -1x + x = 0
9 + 8x = 81 + 0
9 + 8x = 81

Add '-9' to each side of the equation.
9 + -9 + 8x = 81 + -9

Combine like terms: 9 + -9 = 0
0 + 8x = 81 + -9
8x = 81 + -9

Combine like terms: 81 + -9 = 72
8x = 72

Divide each side by '8'.
x = 9

Simplifying
x = 9

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