Create an algebraic equation to solve:
x+x+5=27
x=Michelle
Solve for x.
Add like terms
2x+5=27
Subtract 5 from both sides.
(2x+5)-5=(27)-5
2x=22
Divide 2 from both sides.
(2x)/2=(22)/2
x=11
Michelle has 11 cards.
27-11
=16
Michael has 16 cards.
Hope this helps!
-Benjamin