3.8=3-7.2

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Solution for 3.8=3-7.2 equation: 


Simplifying
3.8 = 3 + -7.2

Combine like terms: 3 + -7.2 = -4.2
3.8 = -4.2

Solving
3.8 = -4.2

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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