-3(x+7)=21

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Solution for -3(x+7)=21 equation: 


Simplifying
-3(x + 7) = 21

Reorder the terms:
-3(7 + x) = 21
(7 * -3 + x * -3) = 21
(-21 + -3x) = 21

Solving
-21 + -3x = 21

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 = 21 + 21

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

Combine like terms: 21 + 21 = 42
-3x = 42

Divide each side by '-3'.
x = -14

Simplifying
x = -14

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