3(19-3x)=21

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Solution for 3(19-3x)=21 equation: 


Simplifying
3(19 + -3x) = 21
(19 * 3 + -3x * 3) = 21
(57 + -9x) = 21

Solving
57 + -9x = 21

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-57' to each side of the equation.
57 + -57 + -9x = 21 + -57

Combine like terms: 57 + -57 = 0
0 + -9x = 21 + -57
-9x = 21 + -57

Combine like terms: 21 + -57 = -36
-9x = -36

Divide each side by '-9'.
x = 4

Simplifying
x = 4

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