Best explained and correct answer gets brainliest.

First of all, you have a denominator in the first term. We have to take both terms to common denominator.

LCM (1;2) = 2



Multiply both fractions for 2 to delete the denominator

√m+3 = 10

Since m+3 is under radical, to delete the radical square √m+3 and 10

m+3 = 100

Move known term (3) to the right of equal with changed sign

m = 100-3

m = 97