30-2x=x-21

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Solution for 30-2x=x-21 equation:


Simplifying
30 + -2x = x + -21

Reorder the terms:
30 + -2x = -21 + x

Solving
30 + -2x = -21 + x

Solving for variable 'x'.

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

Add '-1x' to each side of the equation.
30 + -2x + -1x = -21 + x + -1x

Combine like terms: -2x + -1x = -3x
30 + -3x = -21 + x + -1x

Combine like terms: x + -1x = 0
30 + -3x = -21 + 0
30 + -3x = -21

Add '-30' to each side of the equation.
30 + -30 + -3x = -21 + -30

Combine like terms: 30 + -30 = 0
0 + -3x = -21 + -30
-3x = -21 + -30

Combine like terms: -21 + -30 = -51
-3x = -51

Divide each side by '-3'.
x = 17

Simplifying
x = 17

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