Пошаговое объяснение:
7*(х+6)-200=80,
7*(x+6) = 80 + 200
7*(x+6)=280
x+6 = 280 : 7
x + 6 = 40
x = 40 - 6
x = 34
9*(х-18)+25=205
9*(x-18) = 205 - 25
9*(x-18) = 180
x - 18 = 180 : 9
x - 18 = 20
x = 20 + 18
x = 38
Пошаговое объяснение:
7*(х+6)-200=80,
7*(x+6) = 80 + 200
7*(x+6)=280
x+6 = 280 : 7
x + 6 = 40
x = 40 - 6
x = 34
9*(х-18)+25=205
9*(x-18) = 205 - 25
9*(x-18) = 180
x - 18 = 180 : 9
x - 18 = 20
x = 20 + 18
x = 38