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"the same as the others added together" For example: a=b+c+d a is equal to the sum of b plus c plus d. 9=2+3+4
z remains undefined.
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 B plus C plus D plus E plusorA B C D E plus plus plus plusor variations.
And how does this relate to coins?