12.8+x-8.1=5.4

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Solution for 12.8+x-8.1=5.4 equation: 


Simplifying
12.8 + x + -8.1 = 5.4

Reorder the terms:
12.8 + -8.1 + x = 5.4

Combine like terms: 12.8 + -8.1 = 4.7
4.7 + x = 5.4

Solving
4.7 + x = 5.4

Solving for variable 'x'.

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

Add '-4.7' to each side of the equation.
4.7 + -4.7 + x = 5.4 + -4.7

Combine like terms: 4.7 + -4.7 = 0.0
0.0 + x = 5.4 + -4.7
x = 5.4 + -4.7

Combine like terms: 5.4 + -4.7 = 0.7
x = 0.7

Simplifying
x = 0.7

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