Dasha010113 40*x=240:2,
40x=120,
x=120:40,
x=3.

k*16=106-10,
16k=96,
k=96:16,
k=6.

53*a=470+60,
53a=530,
a=530:53,
a=10.

x:180=72:36,
x:180=2,
x=2*180,
x=360.