-5*(х+3)+3= -17
-5х-15+3= -17
-5х = -17+15-3
-5х = -5
х= -5 : (-5)
х= 1
Ответ: х=1
проверка
-5*(1+3)+3= -17
-5*4+3= -17
-20+3= - 17
-17 = -17
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-5*(х+3)+3= -17
-5х-15+3= -17
-5х = -17+15-3
-5х = -5
х= -5 : (-5)
х= 1
Ответ: х=1
проверка
-5*(1+3)+3= -17
-5*4+3= -17
-20+3= - 17
-17 = -17