The answer might depend on what c and d are supposed to be!
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c = 6 and d = 7
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."
4
2+21=23 or 3+15=18 ok . ans:h-c-d-d-g-g 45+585*=474 552++
Divide both sides by 4: c = d/4