3.9=11-x

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Solution for 3.9=11-x equation:


Simplifying
3.9 = 11 + -1x

Solving
3.9 = 11 + -1x

Solving for variable 'x'.

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

Add 'x' to each side of the equation.
3.9 + x = 11 + -1x + x

Combine like terms: -1x + x = 0
3.9 + x = 11 + 0
3.9 + x = 11

Add '-3.9' to each side of the equation.
3.9 + -3.9 + x = 11 + -3.9

Combine like terms: 3.9 + -3.9 = 0.0
0.0 + x = 11 + -3.9
x = 11 + -3.9

Combine like terms: 11 + -3.9 = 7.1
x = 7.1

Simplifying
x = 7.1

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