first one times 4 ----> 4x + 32y = 12
keep the the 2nd ----> 4x - 2y = 7
34y = 5
y = 5/34
sub into original first
x + 8(5/34) = 3
x = 3 - 40/34 = 31/17
x = 31/17 , y = 5/34
( checked the answer)
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