3[x]-3=-15

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Solution for 3[x]-3=-15 equation: 


Simplifying
3[x] + -3 = -15

Reorder the terms:
-3 + 3x = -15

Solving
-3 + 3x = -15

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + 3x = -15 + 3

Combine like terms: -3 + 3 = 0
0 + 3x = -15 + 3
3x = -15 + 3

Combine like terms: -15 + 3 = -12
3x = -12

Divide each side by '3'.
x = -4

Simplifying
x = -4

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