Units are not compatible

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@unknown wrote:

Hello everyone,

When I was writing an equation, I got the message "Units are not compatible"

Can someone help?

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In the equation for:

• H you've typed "MN" instead of "M*N"; the variable MN doesn't exist.
• K you've typed "b(" instead of "b*"; the function b doesn't exist

The equation for G is OK after changing K.

In such situations, try copying each additive subexpression and evaluating.   That often shows the root cause of the problem.

Stuart