12x-(9x-4)=31

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Solution for 12x-(9x-4)=31 equation:


Simplifying
12x + -1(9x + -4) = 31

Reorder the terms:
12x + -1(-4 + 9x) = 31
12x + (-4 * -1 + 9x * -1) = 31
12x + (4 + -9x) = 31

Reorder the terms:
4 + 12x + -9x = 31

Combine like terms: 12x + -9x = 3x
4 + 3x = 31

Solving
4 + 3x = 31

Solving for variable 'x'.

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

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

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

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

Divide each side by '3'.
x = 9

Simplifying
x = 9

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