1) 5/6 : 4/7 = 35/24
2) 9 : 3/7 = 63/3 = 21
<span>(m-148)-(97+n)=m-148-97-n=m-245-n
318-245-45=28
================
m+527+293=m+820
======
456-(146+m)=456-146-m=310-m
============
============
</span>
<span>63-(25+z)=26
63-25-z=26
38-z=26
z=38-26
z=12
----------
(х-653)+308=417
x-653+308=417
x-345=417
x=417+345
x=762
===============
<span></span></span>