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(13×x-416:4):7=13 cat e x


Răspuns :

( 13 × x - 104) : 7 = 13
13 × x - 104 = 13 × 7
13 × x - 104 = 91
13 × x = 91 + 104
13 × x = 195
x = 195 : 13
x = 15