0,8(4x + 5) = −3,2
3,2x + 4 = −3,2
3,2x = −3,2 − 4
3,2x = −7,2
x = −7,2 : 3,2
$x = -\frac{7,2}{3,2}$
$x = -\frac{72}{32}$
$x = -\frac{9}{4}$
$x = -2\frac{1}{4}$

−2,4(7 − 9y) = −48
−16,8 + 21,6y = −48
21,6y = −48 + 16,8
21,6y = −31,2
y = −31,2 : 21,6
$y = -\frac{312}{216}$
$y = -\frac{13}{9}$
$y = -1\frac{4}{9}$