-17=x-21

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Solution for -17=x-21 equation:


Simplifying
-17 = x + -21

Reorder the terms:
-17 = -21 + x

Solving
-17 = -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.
-17 + -1x = -21 + x + -1x

Combine like terms: x + -1x = 0
-17 + -1x = -21 + 0
-17 + -1x = -21

Add '17' to each side of the equation.
-17 + 17 + -1x = -21 + 17

Combine like terms: -17 + 17 = 0
0 + -1x = -21 + 17
-1x = -21 + 17

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

Divide each side by '-1'.
x = 4

Simplifying
x = 4

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