-21=-4-x

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Solution for -21=-4-x equation:


Simplifying
-21 = -4 + -1x

Solving
-21 = -4 + -1x

Solving for variable 'x'.

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

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

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

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

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

Combine like terms: -4 + 21 = 17
x = 17

Simplifying
x = 17

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