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1)a-b=8 (gunakan cara eliminasi)
(a-a)+(b-[-b])=40-8
2b=32
b=32:2
=16
a-b=8
a-16=8
a=16+8=24
a.b=16.24=384
2)y=-x+3maka,
y+x=3
y-x=11 (gunakan cara eliminasi)
(y-y)+(x-[-x])=3-11
2x=-8
x=-4
y+x=3
y+-4=3
y=7
hp={-4,7}