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5y + 6 = 4x dan 4y = 12
4y = 12
y = 12/4
y = 3
5y + 6 = 4x
5(3) + 6 = 4x
15 + 6 = 4x
21 = 4x
x = 21/4
3x - 2y = 3.(21/4) - 2 .3
= 63/4 - 6
= (63 - 24) / 4
= 39/4
= 9 3/4