3x+(3x-4)=-16

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Solution for 3x+(3x-4)=-16 equation: 


Simplifying
3x + (3x + -4) = -16

Reorder the terms:
3x + (-4 + 3x) = -16

Remove parenthesis around (-4 + 3x)
3x + -4 + 3x = -16

Reorder the terms:
-4 + 3x + 3x = -16

Combine like terms: 3x + 3x = 6x
-4 + 6x = -16

Solving
-4 + 6x = -16

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 + 6x = -16 + 4

Combine like terms: -4 + 4 = 0
0 + 6x = -16 + 4
6x = -16 + 4

Combine like terms: -16 + 4 = -12
6x = -12

Divide each side by '6'.
x = -2

Simplifying
x = -2

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