Carlos is 6
let x be Carlo's age then
2x + 8 = 20 → (solve for x)
subtract 8 from both sides
2x = 20 - 8 = 12
divide both sides by 2
x = [tex]\frac{12}{2}[/tex] = 6
Carlos is 6 years old
c = Carlos
j = John
--------------------
2c + 8 = j
2c + 8 = 20
2c = 20 - 8
2c = 12
c = 12 : 2
c = 6
-------------------------
6*2+8=20
