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(7×a+40+587-643-29)×2=36
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Răspuns :

(7×a+40+587-643-29)×2=36
7a+40+587-643-29=18
7a+40+587-643=47
7a+40+587=690
7a+40=103
7a=63
a=63/7
a=9

(7xa+40+587-643-29)x2=36
7xa+40+587-643-29=36:2
7xa+40+587-643-29=18
7xa+40+587-643=18+29
7xa+40+587-643=47
7xa+40+587=47+643
7xa+40+587=690
7xa+40=690-587
7xa+40=103
7xa=103-40
7xa=63
a=63:7
a=9