Video solusi : Lengkapi bagan berikut.
a. a + b + c = 83
(a - 7) : (b - 7) = 5 : 3
(b - 3) : (c - 3) = 11 : 9
a = ... b = ... c = ...
b. (a + b) : (a - b) = 7 : 5
a : b = ... : ...
(a^2 + b) : (a^2 - b^2) = ... : ...
(a + b^2) : (a^2 - b) = ... : ...