х=7.5
Пошаговое объяснение:
9.9х+12=86.25
9.9х+(12-12)=86.25-12
9.9х=86.25-12
9.9х=74.25
9.9х/9.9=74.25/9.9 ( / - дробь)
х=74.25/9.9
х=7.5
Пошаговое объяснение:
9.9х+12=86.25
9.9х+(12-12)=86.25-12
9.9х=86.25-12
9.9х=74.25
9.9х/9.9=74.25/9.9 ( / - дробь)
х=74.25/9.9
х=7.5