B, though that may not be much help if B is not known!
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by transitive property
If a=b and c=d then (a+c)=(b+d) ? This is proved very simply by the direct application of perhaps the most fundamental statement in all of Algebra: "If equals are added to equals, the sums are equal."
a = 20 b = 60 c = 100
a=24 b=16 c=18
2s-2b= a+b+c-2b simplified that would be a+c-b.