3(5-4x)=21

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Solution for 3(5-4x)=21 equation: 


Simplifying
3(5 + -4x) = 21
(5 * 3 + -4x * 3) = 21
(15 + -12x) = 21

Solving
15 + -12x = 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 + -12x = 21 + -15

Combine like terms: 15 + -15 = 0
0 + -12x = 21 + -15
-12x = 21 + -15

Combine like terms: 21 + -15 = 6
-12x = 6

Divide each side by '-12'.
x = -0.5

Simplifying
x = -0.5

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