21(4+3x)=336

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Solution for 21(4+3x)=336 equation: 


Simplifying
21(4 + 3x) = 336
(4 * 21 + 3x * 21) = 336
(84 + 63x) = 336

Solving
84 + 63x = 336

Solving for variable 'x'.

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

Add '-84' to each side of the equation.
84 + -84 + 63x = 336 + -84

Combine like terms: 84 + -84 = 0
0 + 63x = 336 + -84
63x = 336 + -84

Combine like terms: 336 + -84 = 252
63x = 252

Divide each side by '63'.
x = 4

Simplifying
x = 4

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