a)
18/5=2x+9/4
4x18=2x+9x5
2x+45=72
2x=72-45
2x=27
x=27/2=13,5
b) =
4x/3+1=x+5,3
4x/3+1=x+53/10
40x+30=30x+159
40x-30x=159-30
10x=129
x=129/10
x=12,9
c)=
10x/9-x=6,7-0,5
(10x-9x)=9x6,2
x=55,8
d) 2x + 8 = x + 15
2x-x=15-8
x=7
e) 0, (8) + 3x= 2x + 6
3x-2x=6-8/9
x=46/9=5,(1)
f) 3x + 6,(2) = x +11 ,(4)
3x-x=103/9-56/9
2x=(103-56)/9
2x=47/9
18x=47
x=47/18=2,6(1)