21=x-[-4]

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Solution for 21=x-[-4] equation:


Simplifying
21 = x + -1[-4]

Multiply -1 * -4
21 = x + 4

Reorder the terms:
21 = 4 + x

Solving
21 = 4 + 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.
21 + -1x = 4 + x + -1x

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

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

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

Combine like terms: 4 + -21 = -17
-1x = -17

Divide each side by '-1'.
x = 17

Simplifying
x = 17

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