21-x=210

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Solution for 21-x=210 equation: 


Simplifying
21 + -1x = 210

Solving
21 + -1x = 210

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 + -1x = 210 + -21

Combine like terms: 21 + -21 = 0
0 + -1x = 210 + -21
-1x = 210 + -21

Combine like terms: 210 + -21 = 189
-1x = 189

Divide each side by '-1'.
x = -189

Simplifying
x = -189

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