2.1=0.8-x

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Solution for 2.1=0.8-x equation: 


Simplifying
2.1 = 0.8 + -1x

Solving
2.1 = 0.8 + -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.
2.1 + x = 0.8 + -1x + x

Combine like terms: -1x + x = 0
2.1 + x = 0.8 + 0
2.1 + x = 0.8

Add '-2.1' to each side of the equation.
2.1 + -2.1 + x = 0.8 + -2.1

Combine like terms: 2.1 + -2.1 = 0.0
0.0 + x = 0.8 + -2.1
x = 0.8 + -2.1

Combine like terms: 0.8 + -2.1 = -1.3
x = -1.3

Simplifying
x = -1.3

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