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x+12=4
x=-8
b)
27-x=7
x=20
c)
18+x=7
x=-11
d)c-16=9
c=25
e)
81-x=13
x=68
f)
-19+x=20
x=39
g)
8x=3
x=
h)
x=2
x=
i)
-0,6x=9
x=-15