X-3.5=12

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Solution for X-3.5=12 equation: 


Simplifying
X + -3.5 = 12

Reorder the terms:
-3.5 + X = 12

Solving
-3.5 + X = 12

Solving for variable 'X'.

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

Add '3.5' to each side of the equation.
-3.5 + 3.5 + X = 12 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + X = 12 + 3.5
X = 12 + 3.5

Combine like terms: 12 + 3.5 = 15.5
X = 15.5

Simplifying
X = 15.5

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