40-15-x=7

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Solution for 40-15-x=7 equation:


Simplifying
40 + -15 + -1x = 7

Combine like terms: 40 + -15 = 25
25 + -1x = 7

Solving
25 + -1x = 7

Solving for variable 'x'.

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

Add '-25' to each side of the equation.
25 + -25 + -1x = 7 + -25

Combine like terms: 25 + -25 = 0
0 + -1x = 7 + -25
-1x = 7 + -25

Combine like terms: 7 + -25 = -18
-1x = -18

Divide each side by '-1'.
x = 18

Simplifying
x = 18

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