21-1*2+5-9=18

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Solution for 21-1*2+5-9=18 equation: 


Simplifying
21 + -1 * 2 + 5 + -9 = 18

Multiply -1 * 2
21 + -2 + 5 + -9 = 18

Combine like terms: 21 + -2 = 19
19 + 5 + -9 = 18

Combine like terms: 19 + 5 = 24
24 + -9 = 18

Combine like terms: 24 + -9 = 15
15 = 18

Solving
15 = 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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