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3x + 4y =11
( ditambah)
5y = 10
y = 2
-3x+2 = -1
x= 1
2x - 7y = 2- 14 = - 12
3x+4y=11
________+
5y=10
y=2
3x+4y=11
3x+4.2=11
3x+8=11
3x=3
x=1
jadi, 2x-7y=2.1-7.2=2-14=-12