-(4-x)=21

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


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

Solving
-4 + 1x = 21

Solving for variable 'x'.

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

Add '4' to each side of the equation.
-4 + 4 + 1x = 21 + 4

Combine like terms: -4 + 4 = 0
0 + 1x = 21 + 4
1x = 21 + 4

Combine like terms: 21 + 4 = 25
1x = 25

Divide each side by '1'.
x = 25

Simplifying
x = 25

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