251=109-x

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Solution for 251=109-x equation:


Simplifying
251 = 109 + -1x

Solving
251 = 109 + -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.
251 + x = 109 + -1x + x

Combine like terms: -1x + x = 0
251 + x = 109 + 0
251 + x = 109

Add '-251' to each side of the equation.
251 + -251 + x = 109 + -251

Combine like terms: 251 + -251 = 0
0 + x = 109 + -251
x = 109 + -251

Combine like terms: 109 + -251 = -142
x = -142

Simplifying
x = -142

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