Answer:
x = 15
Step-by-step explanation:
Cameron started with 20 pieces of gum and gave away x number of pieces.
Cameron = 20 - x
Connor started with 35 pieces of gum and gave away twice as many as Cameron did.
Connor = 35 - 2x
Equate both Cameron and Connor expression
20 - x = 35 - 2x
Collect like terms
20 - 35 = -2x + x
-15 = -x
Divide both sides by -1
15 = x
x = 15
Check:
Cameron = 20 - x
= 20 - 15
= 5
Connor = 35 - 2x
= 35 - 2(15)
= 35 - 30
= 5
