8x-7x+10=12
x+10=12
x=12-10
x=2
========
13y+15y-24=60
28y-24=60
28y=60+24
28y=84
y=84:28
y=3
==========
3z-2z+15=32
z+15=32
z=32-15
z=17
==============
6t+5t-33=0
11t-33=0
11t=33
t=33:11
t=3
==========
(x+59):42=86
x+59=86*42
x+59=3612
x=3612-59
x=3553
==========
528:k-24=64
528:k=64+24
528:k=88
k=528:88
k=6
============