-3(x+5)=21

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


Simplifying
-3(x + 5) = 21

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

Solving
-15 + -3x = 21

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 = 21 + 15

Combine like terms: -15 + 15 = 0
0 + -3x = 21 + 15
-3x = 21 + 15

Combine like terms: 21 + 15 = 36
-3x = 36

Divide each side by '-3'.
x = -12

Simplifying
x = -12

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