решите уравнение: 12x - 5x = 3,192 и 7x + 5x +0,28 =9,91

Question

решите уравнение: 12x - 5x = 3,192 и 7x + 5x +0,28 =9,91

Answer 1

7х=3,192

х=0,156

 

и

12х=9,63

х=0,8025

Answer 2

1)
(12-5)x=3,192
7x=3,192
x=3,192:7
x=0.456

и

2)
(7+5)х+0,28=9.91
12х+0.28=9.91
12х=9.91-0.28
12х=9.63
х=9.63:12
х=0.8025