-3+x=15

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Solution for -3+x=15 equation: 


Simplifying
-3 + x = 15

Solving
-3 + x = 15

Solving for variable 'x'.

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

Add '3' to each side of the equation.
-3 + 3 + x = 15 + 3

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

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

Simplifying
x = 18

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