2.5-4.7=7.7

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Solution for 2.5-4.7=7.7 equation: 


Simplifying
2.5 + -4.7 = 7.7

Combine like terms: 2.5 + -4.7 = -2.2
-2.2 = 7.7

Solving
-2.2 = 7.7

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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