a)5×x+7=272
5x=272-7
5x=265
x=53
Verific:
5×53+7=265+7=272 ✔
b)(8+3×x)×14-30=1762
112+42x-30=1762
82+42x=1762
42x=1762-82
42x=1680
x=40
Verific:
(8+3×40)×14-30=(8+120)×14-30=128×14-30=1792-30=1762 ✔
Problema formulată de mine:
6×x+9=327
6x=327-3
6x=318
x=53
Verific:
6×53+9=318+9=327 ✔