(31-x)=2x+4

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Solution for (31-x)=2x+4 equation:


Simplifying
(31 + -1x) = 2x + 4

Remove parenthesis around (31 + -1x)
31 + -1x = 2x + 4

Reorder the terms:
31 + -1x = 4 + 2x

Solving
31 + -1x = 4 + 2x

Solving for variable 'x'.

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

Add '-2x' to each side of the equation.
31 + -1x + -2x = 4 + 2x + -2x

Combine like terms: -1x + -2x = -3x
31 + -3x = 4 + 2x + -2x

Combine like terms: 2x + -2x = 0
31 + -3x = 4 + 0
31 + -3x = 4

Add '-31' to each side of the equation.
31 + -31 + -3x = 4 + -31

Combine like terms: 31 + -31 = 0
0 + -3x = 4 + -31
-3x = 4 + -31

Combine like terms: 4 + -31 = -27
-3x = -27

Divide each side by '-3'.
x = 9

Simplifying
x = 9

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