18-3(x+5)=-21

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


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

Reorder the terms:
18 + -3(5 + x) = -21
18 + (5 * -3 + x * -3) = -21
18 + (-15 + -3x) = -21

Combine like terms: 18 + -15 = 3
3 + -3x = -21

Solving
3 + -3x = -21

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 = -21 + -3

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

Combine like terms: -21 + -3 = -24
-3x = -24

Divide each side by '-3'.
x = 8

Simplifying
x = 8

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