14.
d) 7x-3/6=5x+1/2 amplificam pe 5x+1/2 cu 3
7x-3=15x+3
-3-3=15x-7x
-6=8x
x=-6/8=-3/4
h)x-2/5+2x-5/4+4x-1/20=4-x pe prima amplificam cu 4 pe a doua cu 5
4x-8+10x-25+4x-1=4-x
18x-34=4-x
18x+x=4+34
19x=38
x=38/19=2
5.
b)3(x+2)=2x+5
3x+6=2x+5
3x-2x=5-6
x=-1 ∈ Z
d)2(3x-1,6)-3=2x+1
6x-3,2-3=2x+1
6x-6,2=2x+1
6x-2x=1+6,2
4x=7,2
x=7,2/4=1,8 x ∈ Q
e)-4(x+√2)-3(x+√2)=-11x+2√2
-4x-4√2-3x-3√2=-11x+2√2
-7x-7√2=-11x+2√2
-7√2-2√2=-11x+7x
-9√2=-4x
x=-9√2/4 x ∈ R
