a+b-c =
a=3, b=(-9), c=5
2c+3a-4b=
a=(-6), b=(-3), c=4
3z+xy=
x=2, y=9, z=(-5)
y(z+x)=
w=(-6), x=4, y=3, z=(-8)
wz-4xy=
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