How do you solve #36-4d=4(9-d)#?

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Answer 1 · 2016-08-16T18:25:53

#x# has any value.

#36-4d=4(9-d)#

Solve as usual - remove the brackets.

#36-4d=36-4d" ???? both sides are the same"#

Continue anyway...move variables to one side and constants to the other.....

#4d - 4d = 36-36#

#0 = 0#

We have ended up with a true statement, but there is no #x# term to solve for??

This is an indication that we are working with a special kind of equation called an IDENTITY.

An identity is true for any value of #x#

The answer will be: #x# has any value.