15+7-x=18

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Solution for 15+7-x=18 equation: 


Simplifying
15 + 7 + -1x = 18

Combine like terms: 15 + 7 = 22
22 + -1x = 18

Solving
22 + -1x = 18

Solving for variable 'x'.

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

Add '-22' to each side of the equation.
22 + -22 + -1x = 18 + -22

Combine like terms: 22 + -22 = 0
0 + -1x = 18 + -22
-1x = 18 + -22

Combine like terms: 18 + -22 = -4
-1x = -4

Divide each side by '-1'.
x = 4

Simplifying
x = 4

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