15-2x=20-2x

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Solution for 15-2x=20-2x equation: 


Simplifying
15 + -2x = 20 + -2x

Add '2x' to each side of the equation.
15 + -2x + 2x = 20 + -2x + 2x

Combine like terms: -2x + 2x = 0
15 + 0 = 20 + -2x + 2x
15 = 20 + -2x + 2x

Combine like terms: -2x + 2x = 0
15 = 20 + 0
15 = 20

Solving
15 = 20

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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