54=39-x

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Solution for 54=39-x equation:


Simplifying
54 = 39 + -1x

Solving
54 = 39 + -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.
54 + x = 39 + -1x + x

Combine like terms: -1x + x = 0
54 + x = 39 + 0
54 + x = 39

Add '-54' to each side of the equation.
54 + -54 + x = 39 + -54

Combine like terms: 54 + -54 = 0
0 + x = 39 + -54
x = 39 + -54

Combine like terms: 39 + -54 = -15
x = -15

Simplifying
x = -15

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