2.1x+(-3.9)=10.8

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Solution for 2.1x+(-3.9)=10.8 equation: 


Simplifying
2.1x + (-3.9) = 10.8
2.1x + -3.9 = 10.8

Reorder the terms:
-3.9 + 2.1x = 10.8

Solving
-3.9 + 2.1x = 10.8

Solving for variable 'x'.

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

Add '3.9' to each side of the equation.
-3.9 + 3.9 + 2.1x = 10.8 + 3.9

Combine like terms: -3.9 + 3.9 = 0.0
0.0 + 2.1x = 10.8 + 3.9
2.1x = 10.8 + 3.9

Combine like terms: 10.8 + 3.9 = 14.7
2.1x = 14.7

Divide each side by '2.1'.
x = 7

Simplifying
x = 7

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