-1.8(-1.8)+1.6=-7.9

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Solution for -1.8(-1.8)+1.6=-7.9 equation: 


Simplifying
-1.8(-1.8) + 1.6 = -7.9

Multiply -1.8 * -1.8
3.24 + 1.6 = -7.9

Combine like terms: 3.24 + 1.6 = 4.84
4.84 = -7.9

Solving
4.84 = -7.9

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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