3(21-x)=4x-21

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


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

Reorder the terms:
63 + -3x = -21 + 4x

Solving
63 + -3x = -21 + 4x

Solving for variable 'x'.

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

Add '-4x' to each side of the equation.
63 + -3x + -4x = -21 + 4x + -4x

Combine like terms: -3x + -4x = -7x
63 + -7x = -21 + 4x + -4x

Combine like terms: 4x + -4x = 0
63 + -7x = -21 + 0
63 + -7x = -21

Add '-63' to each side of the equation.
63 + -63 + -7x = -21 + -63

Combine like terms: 63 + -63 = 0
0 + -7x = -21 + -63
-7x = -21 + -63

Combine like terms: -21 + -63 = -84
-7x = -84

Divide each side by '-7'.
x = 12

Simplifying
x = 12

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