21=15+3(2-1)

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Solution for 21=15+3(2-1) equation: 


Simplifying
21 = 15 + 3(2 + -1)

Combine like terms: 2 + -1 = 1
21 = 15 + 3(1)

Multiply 3 * 1
21 = 15 + 3

Combine like terms: 15 + 3 = 18
21 = 18

Solving
21 = 18

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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