3(5-x)=-21

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


Simplifying
3(5 + -1x) = -21
(5 * 3 + -1x * 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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