4x=3(21-x)

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


Simplifying
4x = 3(21 + -1x)
4x = (21 * 3 + -1x * 3)
4x = (63 + -3x)

Solving
4x = 63 + -3x

Solving for variable 'x'.

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

Add '3x' to each side of the equation.
4x + 3x = 63 + -3x + 3x

Combine like terms: 4x + 3x = 7x
7x = 63 + -3x + 3x

Combine like terms: -3x + 3x = 0
7x = 63 + 0
7x = 63

Divide each side by '7'.
x = 9

Simplifying
x = 9

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