15-x=12.4

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Solution for 15-x=12.4 equation: 


Simplifying
15 + -1x = 12.4

Solving
15 + -1x = 12.4

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + -1x = 12.4 + -15

Combine like terms: 15 + -15 = 0
0 + -1x = 12.4 + -15
-1x = 12.4 + -15

Combine like terms: 12.4 + -15 = -2.6
-1x = -2.6

Divide each side by '-1'.
x = 2.6

Simplifying
x = 2.6

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