(8×9+s-40)- (20+5)=10:2
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Răspuns :

(8×9+s-40)-(20+5)=10:2
(72+s-40)-25=5
s+32-25=5
s+7=5
s=-2

(8×9 + s - 40) - (20 + 5) = 10 : 2

72 + s - 40 - 20 - 5 = 5

s = 5 - 72 + 40 + 20 + 5

s = -2