2x+8x-9=31

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Solution for 2x+8x-9=31 equation:


Simplifying
2x + 8x + -9 = 31

Reorder the terms:
-9 + 2x + 8x = 31

Combine like terms: 2x + 8x = 10x
-9 + 10x = 31

Solving
-9 + 10x = 31

Solving for variable 'x'.

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

Add '9' to each side of the equation.
-9 + 9 + 10x = 31 + 9

Combine like terms: -9 + 9 = 0
0 + 10x = 31 + 9
10x = 31 + 9

Combine like terms: 31 + 9 = 40
10x = 40

Divide each side by '10'.
x = 4

Simplifying
x = 4

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