Răspuns :
(528-179):(7+x)=7 rest6
528-179=(7+x)7+6
528-179=49+7x+6
528-179-49-6=7x
294=7x
294:7=x
x=42
528-179=(7+x)7+6
528-179=49+7x+6
528-179-49-6=7x
294=7x
294:7=x
x=42
(528 - 179) : (7 + a) = 7 r 6
349 : (7+ a)= 7 r 6
349 = (7 + a) x 7 + 6
349 - 6 = 49 + 7a
343 - 49 = 7a
294 = 7a
a = 294 : 7
a = 42
349 : (7+ a)= 7 r 6
349 = (7 + a) x 7 + 6
349 - 6 = 49 + 7a
343 - 49 = 7a
294 = 7a
a = 294 : 7
a = 42