81-2x+8x+21=

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Solution for 81-2x+8x+21= equation:


Simplifying
81 + -2x + 8x + 21 = 0

Reorder the terms:
81 + 21 + -2x + 8x = 0

Combine like terms: 81 + 21 = 102
102 + -2x + 8x = 0

Combine like terms: -2x + 8x = 6x
102 + 6x = 0

Solving
102 + 6x = 0

Solving for variable 'x'.

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

Add '-102' to each side of the equation.
102 + -102 + 6x = 0 + -102

Combine like terms: 102 + -102 = 0
0 + 6x = 0 + -102
6x = 0 + -102

Combine like terms: 0 + -102 = -102
6x = -102

Divide each side by '6'.
x = -17

Simplifying
x = -17

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