3[5+x]=12

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Solution for 3[5+x]=12 equation: 


Simplifying
3[5 + x] = 12
[5 * 3 + x * 3] = 12
[15 + 3x] = 12

Solving
15 + 3x = 12

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + 3x = 12 + -15

Combine like terms: 15 + -15 = 0
0 + 3x = 12 + -15
3x = 12 + -15

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

Divide each side by '3'.
x = -1

Simplifying
x = -1

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