399=21(4+5x)

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Solution for 399=21(4+5x) equation:


Simplifying
399 = 21(4 + 5x)
399 = (4 * 21 + 5x * 21)
399 = (84 + 105x)

Solving
399 = 84 + 105x

Solving for variable 'x'.

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

Add '-105x' to each side of the equation.
399 + -105x = 84 + 105x + -105x

Combine like terms: 105x + -105x = 0
399 + -105x = 84 + 0
399 + -105x = 84

Add '-399' to each side of the equation.
399 + -399 + -105x = 84 + -399

Combine like terms: 399 + -399 = 0
0 + -105x = 84 + -399
-105x = 84 + -399

Combine like terms: 84 + -399 = -315
-105x = -315

Divide each side by '-105'.
x = 3

Simplifying
x = 3

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