40=57-x

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Solution for 40=57-x equation:


Simplifying
40 = 57 + -1x

Solving
40 = 57 + -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.
40 + x = 57 + -1x + x

Combine like terms: -1x + x = 0
40 + x = 57 + 0
40 + x = 57

Add '-40' to each side of the equation.
40 + -40 + x = 57 + -40

Combine like terms: 40 + -40 = 0
0 + x = 57 + -40
x = 57 + -40

Combine like terms: 57 + -40 = 17
x = 17

Simplifying
x = 17

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