3(x+18)=21-3(x+5)

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Solution for 3(x+18)=21-3(x+5) equation:


Simplifying
3(x + 18) = 21 + -3(x + 5)

Reorder the terms:
3(18 + x) = 21 + -3(x + 5)
(18 * 3 + x * 3) = 21 + -3(x + 5)
(54 + 3x) = 21 + -3(x + 5)

Reorder the terms:
54 + 3x = 21 + -3(5 + x)
54 + 3x = 21 + (5 * -3 + x * -3)
54 + 3x = 21 + (-15 + -3x)

Combine like terms: 21 + -15 = 6
54 + 3x = 6 + -3x

Solving
54 + 3x = 6 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
54 + 3x + 3x = 6 + -3x + 3x

Combine like terms: 3x + 3x = 6x
54 + 6x = 6 + -3x + 3x

Combine like terms: -3x + 3x = 0
54 + 6x = 6 + 0
54 + 6x = 6

Add '-54' to each side of the equation.
54 + -54 + 6x = 6 + -54

Combine like terms: 54 + -54 = 0
0 + 6x = 6 + -54
6x = 6 + -54

Combine like terms: 6 + -54 = -48
6x = -48

Divide each side by '6'.
x = -8

Simplifying
x = -8

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