6.9=7.9-0.2x

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Solution for 6.9=7.9-0.2x equation: 


Simplifying
6.9 = 7.9 + -0.2x

Solving
6.9 = 7.9 + -0.2x

Solving for variable 'x'.

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

Add '0.2x' to each side of the equation.
6.9 + 0.2x = 7.9 + -0.2x + 0.2x

Combine like terms: -0.2x + 0.2x = 0.0
6.9 + 0.2x = 7.9 + 0.0
6.9 + 0.2x = 7.9

Add '-6.9' to each side of the equation.
6.9 + -6.9 + 0.2x = 7.9 + -6.9

Combine like terms: 6.9 + -6.9 = 0.0
0.0 + 0.2x = 7.9 + -6.9
0.2x = 7.9 + -6.9

Combine like terms: 7.9 + -6.9 = 1
0.2x = 1

Divide each side by '0.2'.
x = 5

Simplifying
x = 5

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