7x-[4x-39]=12

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Solution for 7x-[4x-39]=12 equation:


Simplifying
7x + -1[4x + -39] = 12

Reorder the terms:
7x + -1[-39 + 4x] = 12
7x + [-39 * -1 + 4x * -1] = 12
7x + [39 + -4x] = 12

Reorder the terms:
39 + 7x + -4x = 12

Combine like terms: 7x + -4x = 3x
39 + 3x = 12

Solving
39 + 3x = 12

Solving for variable 'x'.

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

Add '-39' to each side of the equation.
39 + -39 + 3x = 12 + -39

Combine like terms: 39 + -39 = 0
0 + 3x = 12 + -39
3x = 12 + -39

Combine like terms: 12 + -39 = -27
3x = -27

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

Simplifying
x = -9

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