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t₂' = a - 3
t₁ = 2/5t₂
a...?
t₁'/t₂' = t₁/t₂
2a/a-3 = 2/5t₂/t₂
2a = 2/5 (a - 3) (kedua ruas dikalikan 10)
20a = 4a - 12
20a - 4a = 12
16a = 12
a = 12/16
a = 3/4