1.
3x - 33/16 = 3/8
48x-33=6
48x=39 =>x=39/48=13/16
2.
x/4 = 5+2,5
x/4 = 7,5
x=4·7,5
x=30
3.
x/5 = 4,8-2,6
x/5 = 2,2
x=5·2,2
x=11
4.
2x/3 = 8 + 4/3
2x=24+4
2x=28
x=14
5.
3x/4 = 3/2 - 2/3
9x=18-8
9x=10
x=10/9=1,(1)
6.
x + x/2 = 9/2
2x+x=9
3x=9
x=3
7.
n+n+1+n+2=54
3n=51
n=17
Numerele sunt 17, 18 si 19.
8.
x - 2x/5 = 37+23
3x/5 = 60
3x=300
x=100
9.
(x - 3x/4) + 18 = x/2
x/4 + 18 = x/2
x+72=2x
x=72