7-x=40

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Solution for 7-x=40 equation: 


Simplifying
7 + -1x = 40

Solving
7 + -1x = 40

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-7' to each side of the equation.
7 + -7 + -1x = 40 + -7

Combine like terms: 7 + -7 = 0
0 + -1x = 40 + -7
-1x = 40 + -7

Combine like terms: 40 + -7 = 33
-1x = 33

Divide each side by '-1'.
x = -33

Simplifying
x = -33

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