b) 3(y-4) = 24-2(y+3)
3y-12 = 24-2y-6
3y+2y = 24-6+12
5y = 30 /:5
y = 6
c) x = 2,1+0,3x
x-0,3x = 2,1
0,7x = 2,1 /:0,7
x = 3
d) 1,5x = 23,4 /: 1,5
x = [tex]\frac{234}{10}[/tex]: [tex]\frac{15}{10}[/tex]
x = [tex]\frac{234}{10}[/tex] * [tex]\frac{10}{15}[/tex]
x = [tex]\frac{234}{15}[/tex] = [tex]\frac{78}{5}[/tex] = 15 [tex]\frac{3}{5}[/tex] = 15,6
e) [tex]\frac{1}{4}[/tex]x -9 = 16
[tex]\frac{1}{4}[/tex]x = 16+9
[tex]\frac{1}{4}[/tex]x = 25 /: [tex]\frac{1}{4}[/tex]
x = 25 * [tex]\frac{4}{1}[/tex]
x = 100
