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4x-6y=16 || ×1 || 4x-6y=16
------------------- +
10x = 30
x = 30/10
x= 3
3(3) + 3y = 7
9 + 3y = 7
3y = 7 - 9
3y = -2
y = -2/3
semoga bermanfaat :)