15-x=-3

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Solution for 15-x=-3 equation: 


Simplifying
15 + -1x = -3

Solving
15 + -1x = -3

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 = -3 + -15

Combine like terms: 15 + -15 = 0
0 + -1x = -3 + -15
-1x = -3 + -15

Combine like terms: -3 + -15 = -18
-1x = -18

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

Simplifying
x = 18

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