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x-4=15+3x /-x-15
-19=2x /:2
-9,5=x
b) x+1/2=(x-2)*2-1/2
x+1/2=2x-4-1/2 /-1/2-2x
-x=-5 /*(-1)
x=5
c) 4(x+2) - 1/2(2x-1)=1/2 - 1
4x+8-x+1/2=-1/2
3x+8 1/2=-1/2 /-8 1/2
3x=-9 /:3
x=-3
d) 6-(3x-4)= 5+x
6-3x+4= 5+x /-x
10-4x=5 /+4x-5
5=4x
x=5/4
e) -3,5x+4(x-3)=-4,5
-3,5x+4x-12=-4,5 /+12
0,5x= 7,5 /*2
x=15
f) 4+x/2-x=0 /*2
4+x-2x=0 /-4
-x=-4 /*(-1)
x=4
g) x+x-3/4=1 /*4
4x+x-3=4
5x-3=4 /+3
5x=7 /:5
x=7/5
h) 1/3x - 1/2+ 2 2/3x = x+1
1/3x-1/2+8/3x=x+1 /*6
2x-3+16x=6x+6
18x-3=6x+6 /-6x+3
12x=9 /:12
x=9/12