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b) a=bc-d , b=a-c-d , c=a-b-d , d=bc-a
c) a=bc+d , b=a-d / c , c=a-d / b , d=a-bc
d) a=b(c+d)=bc+bd b=a / c+d , c=a/b - d , d=a/b - c
e) Q=mg , m=Q/g , g=Q/m
f) V=Ph , P=V/h , h=V/P
g) P=UI , U=P/I , I=P/U
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