Answer:
1) a=42
2) b=8.8
3) -17/18c-102
4) 1972/355 or 5.88
5) e=-198
6)f=17.2
Hope it helps
Step-by-step explanation:
1). 4/7a+5/14a=39
we multiply both sides by 14
we get : 8a+5a=546
13a=546
a=546/13
a=42
2) -12.6-4.9b=-154
-17.5b=-154
we devide both sides of the equation by -17.5
then we get b=8.8
3).
