243=139-x

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Solution for 243=139-x equation:


Simplifying
243 = 139 + -1x

Solving
243 = 139 + -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.
243 + x = 139 + -1x + x

Combine like terms: -1x + x = 0
243 + x = 139 + 0
243 + x = 139

Add '-243' to each side of the equation.
243 + -243 + x = 139 + -243

Combine like terms: 243 + -243 = 0
0 + x = 139 + -243
x = 139 + -243

Combine like terms: 139 + -243 = -104
x = -104

Simplifying
x = -104

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