2(1)+2.5(-3)=4.5

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Solution for 2(1)+2.5(-3)=4.5 equation: 


Simplifying
2(1) + 2.5(-3) = 4.5

Multiply 2 * 1
2 + 2.5(-3) = 4.5

Multiply 2.5 * -3
2 + -7.5 = 4.5

Combine like terms: 2 + -7.5 = -5.5
-5.5 = 4.5

Solving
-5.5 = 4.5

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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