[3(x+7)]=18

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Solution for [3(x+7)]=18 equation:


Simplifying
[3(x + 7)] = 18

Reorder the terms:
[3(7 + x)] = 18
[(7 * 3 + x * 3)] = 18
[(21 + 3x)] = 18
[21 + 3x] = 18

Remove brackets around [21 + 3x]
21 + 3x = 18

Solving
21 + 3x = 18

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 3x = 18 + -21

Combine like terms: 21 + -21 = 0
0 + 3x = 18 + -21
3x = 18 + -21

Combine like terms: 18 + -21 = -3
3x = -3

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

Simplifying
x = -1

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