5.
(7x-12)/5-(x-1)/5=x/2-(19-6x)/7
(7x-12-x+1)/5=(7x-38+12x)/14
(6x-11)/5=(19x-38)/14
84x-154=95x-190
11x=36
x=36/11
6.
1-x+(2-x)/2+(3-x)/3=(4+x)/4+(5+x)/5+(6-x)/6
1-x+1-x/2+1-x/3=1+x/4+1+x/5+1-x/6
-x-x/2-x/3=x/4+x/5-x/6
-1-1/2-1/3=1/4+1/5-1/6 nu are solutie
7.
(x-5)/2-(x-4)/3+(x-3)/4=(5-x)/4+(4-x)/3+(3-x)/2
6x-30-4x+16+3x-9=15-3x+16-4x+18-6x
5x-23=49-13x
18x=72
x=4
8.6x+3+2(x-4)=7(x+2)
6x+3+2x-8=7x+14
8x-5=7x+14
x=14+5
x=19
9.4(3x-5)=10x-13-3(4x-7)
12x-20=10x-13-12x-21
12x-20=-2x-34
14x=-34+20
14x=-14
x=-1
