X+12=15+18

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Solution for X+12=15+18 equation: 


Simplifying
X + 12 = 15 + 18

Reorder the terms:
12 + X = 15 + 18

Combine like terms: 15 + 18 = 33
12 + X = 33

Solving
12 + X = 33

Solving for variable 'X'.

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

Add '-12' to each side of the equation.
12 + -12 + X = 33 + -12

Combine like terms: 12 + -12 = 0
0 + X = 33 + -12
X = 33 + -12

Combine like terms: 33 + -12 = 21
X = 21

Simplifying
X = 21

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