8.6=2.1-1.3X

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Solution for 8.6=2.1-1.3X equation: 


Simplifying
8.6 = 2.1 + -1.3X

Solving
8.6 = 2.1 + -1.3X

Solving for variable 'X'.

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

Add '1.3X' to each side of the equation.
8.6 + 1.3X = 2.1 + -1.3X + 1.3X

Combine like terms: -1.3X + 1.3X = 0.0
8.6 + 1.3X = 2.1 + 0.0
8.6 + 1.3X = 2.1

Add '-8.6' to each side of the equation.
8.6 + -8.6 + 1.3X = 2.1 + -8.6

Combine like terms: 8.6 + -8.6 = 0.0
0.0 + 1.3X = 2.1 + -8.6
1.3X = 2.1 + -8.6

Combine like terms: 2.1 + -8.6 = -6.5
1.3X = -6.5

Divide each side by '1.3'.
X = -5

Simplifying
X = -5

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