4)1,6x+8- x/4=3x-4/10 aducem la acelasi numitor(20)
32x+160-5x=6x-8
27x+160=6x-8
27x-6x=-8-160
21x=-168
x=-8
5)6(3x+2)=5(2x-4)
18x+12=10x-20
18x-10x=-20-12
8x=-32
x=-4
6)x-1/5 +x+1/3= 2 aducem la acelasi numitor (15)
3x-3+5x+5=30
8x+2=30
8x=30-2
8x=28
x=28/8=14/4=7/2