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2y = 3x - 12 ---> ( ÷ 2)
y = 3/2 x - 6
2) 3x = 6y - 24
-6y = -3x - 24 ---> (÷ 6)
-y = -½ x - 4
y = ½ x + 4
3) 4x + 5y = 30
5y = -4x + 30 ---> (÷ 5)
y = -4/5 x + 6