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a fost răspuns

{[(7-3)*5-2+3]7+9}:x=4

Răspuns :

[(4x5-2+3)7+9]=4x
21x7+9=4x
156=4x
x=39
Andreeacornelia
{[4*5-2+3]*7+9}/x=4
{[20-2+3]*7+9}/x=4
{[(18+3]*7+9}/x=4
{21*7+9}/x=4
{147+9}/x=4
156/x=4
x=156/4
x=39