.40+12+x=20

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Solution for .40+12+x=20 equation: 


Simplifying
0.40 + 12 + x = 20

Combine like terms: 0.40 + 12 = 12.4
12.4 + x = 20

Solving
12.4 + x = 20

Solving for variable 'x'.

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

Add '-12.4' to each side of the equation.
12.4 + -12.4 + x = 20 + -12.4

Combine like terms: 12.4 + -12.4 = 0.0
0.0 + x = 20 + -12.4
x = 20 + -12.4

Combine like terms: 20 + -12.4 = 7.6
x = 7.6

Simplifying
x = 7.6

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