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(1000-h x 2-25 x 4): 6=143

Răspuns :

(1000-2h-25x4):6=143
(1000-2h-100):6=143
(900-2h):6=143
900-2h/6=143x6
900-2h=858
-2h=858-900
-2h=-42
h=-42:-2
h=21