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90 - a = 72 - 2/5 a
90 - 72 = a - 2/5 a
18 = 3/5 a
3a = 18 x 5
a = 90/3
a = 30
90 - A = 72 - 2/5 A
-A + 2/5 A = 72 - 90
-3/5 A = -18
A = -18 . -5/3
A = 30