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x + -y = 2 -
2y = 8
y=8/2=4
cari nilai x
x+y = 10
x+4 = 10
x=10-4=6
maka x=6, dan y=4
x-y=2 -
2y=8
y=8/2
y=4
x+y=10
x-y=2 +
2x=12
x=12/2
x=6