X-8.7=-3.9

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Solution for X-8.7=-3.9 equation: 


Simplifying
X + -8.7 = -3.9

Reorder the terms:
-8.7 + X = -3.9

Solving
-8.7 + X = -3.9

Solving for variable 'X'.

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

Add '8.7' to each side of the equation.
-8.7 + 8.7 + X = -3.9 + 8.7

Combine like terms: -8.7 + 8.7 = 0.0
0.0 + X = -3.9 + 8.7
X = -3.9 + 8.7

Combine like terms: -3.9 + 8.7 = 4.8
X = 4.8

Simplifying
X = 4.8

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