Hi, welcome to the forum
I know this does not answer your question, but I hardly see how...
=D12+E22+E23+E24+E25+E26-F12+F13+F14+F15-D20+G12+G13+G14
is simpler than
D12+SUM(E22:E26)-SUM(F12:F15)-D20+SUM(G12:G14)
your "simpler" formula is actually in error anyway, if you really wanted to extend it like that, the 2nd SUM is negative, so all those ranges need to be negative as well...
=D12+E22+E23+E24+E25+E26-F12-F13-F14-F15-D20+G12+G13+G14
But this could be simplified further...
=SUM(D12,E22:E26,-F12:F15,-D20,G12:G14)
ARRAY entered using CTRL SHFT ENTER, not just ENTER
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