Drew has 50 red, green, and blue marbles. he has six more red marbles than blue marbles and four fewer green marbles tahn blue marbles. write and solve an equation to determie how many marbles drew has.

R + g + b = 50
r = b + 6
g = b - 4

(b + 6) + (b - 4) + b = 50
3b + 2 = 50
3b = 50 - 2
3b = 48
b = 48/3
b = 16 <=== 16 blue marbles

r = b + 6
r = 16 + 6
r = 22 <=== 22 red marbles

g = b - 4
g = 16 - 4
g = 12 <=== 12 green marbles