(y+4)-(y-1)=6y
y+4-y+1=6y
5=6y
6y=5
y=5/6
3p-1-(p+3)=1
3p-1-p-3=1
2p-4=1
2p=5
p=5/2=2.5
6x-(7x-12)=101
6x-7x+12=101
-x=89
x=-89
20x=19-(3+12x)
20x=19-3-12x
20x+12x=16
32x=16
x=16/32=1/2=0.5
(13x-15)-(9+6x)=-3x
13x-15-9-6x=-3x
7x-24=-3x
7x+3x=24
10x=24
x=24/10=2.4
12-(4x-18)=(36+4x)+(18-6x)
12-4x+18=36+4x+18-6x
6x-4x-4x=36+18-12-18
-2x=24
x=-24/2=-12