решите уравнение 8(х+19)+31=255

8(х+19)+31=255

8х+152+31=255

8х=255-152-31

8х=72

х=72/8

х=9

ответ:9

8(х + 19) + 31 = 255,

8х + 152 + 31 = 255,

8х + 183 = 255,

8х = 255 - 183,

8х = 72,

х = 72 : 8,

х = 9

2-й способ

8(х + 19) + 3 1 =255

8(х + 19 ) = 255 - 31

8(х + 19 ) = 224

х + 19 = 224 : 8

х + 19 = 28

х = 28 - 19

х = 9