3x-(x-21)=0

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Solution for 3x-(x-21)=0 equation:


Simplifying
3x + -1(x + -21) = 0

Reorder the terms:
3x + -1(-21 + x) = 0
3x + (-21 * -1 + x * -1) = 0
3x + (21 + -1x) = 0

Reorder the terms:
21 + 3x + -1x = 0

Combine like terms: 3x + -1x = 2x
21 + 2x = 0

Solving
21 + 2x = 0

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 2x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 2x = 0 + -21
2x = 0 + -21

Combine like terms: 0 + -21 = -21
2x = -21

Divide each side by '2'.
x = -10.5

Simplifying
x = -10.5

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