2,8x = 7,28
x = 7,28 : 2,8
x = 2,6
$\snippet{name: long_division, x: 7.28, y: 2.8, decimal: true}$
7,28 + y = 9
y = 9 − 7,28
y = 1,72
$\snippet{name: op_column, sign: '-', x: '9.00', y: '7.28', z: '1.72'}$
9 : z = 0,15
z = 9 : 0,15
z = 60
$\snippet{name: long_division, x: 9, y: 0.15, decimal: true}$

a : 1,4 = 2,15
a = 2,15 * 1,4
a = 3,01
$\snippet{name: column_multiplication, x: 2.15, y: 1.4}$

z = 1,2 * 4,5 = 5,4
$\snippet{name: column_multiplication, x: 1.2, y: 4.5}$
y : 0,3 = 5,4
y = 5,4 * 0,3
y = 1,62
$\snippet{name: column_multiplication, x: 5.4, y: 0.3}$
1,2 + x = 1,62
x = 1,62 − 1,2
x = 0,42
$\snippet{name: op_column, sign: '-', x: '1.62', y: '1.20', z: '0.42'}$

a : 0,16 = 40
a = 40 * 0,16
a = 6,4
$\snippet{name: column_multiplication, x: 40.0, y: 0.16}$
0,32c = 40
c = 40 : 0,32
c = 125
$\snippet{name: long_division, x: 40, y: 0.32, decimal: true}$
6,4 : b = 0,32
b = 6,4 : 0,32
b = 20
$\snippet{name: long_division, x: 6.4, y: 0.32, decimal: true}$