X-7.8=-3.1

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Solution for X-7.8=-3.1 equation: 


Simplifying
X + -7.8 = -3.1

Reorder the terms:
-7.8 + X = -3.1

Solving
-7.8 + X = -3.1

Solving for variable 'X'.

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

Add '7.8' to each side of the equation.
-7.8 + 7.8 + X = -3.1 + 7.8

Combine like terms: -7.8 + 7.8 = 0.0
0.0 + X = -3.1 + 7.8
X = -3.1 + 7.8

Combine like terms: -3.1 + 7.8 = 4.7
X = 4.7

Simplifying
X = 4.7

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