Answer:
a= 1/2b
Step-by-step explanation:
a+b=3a
a=3a-b
a-3a= - b
- 2a= - b
a=1/2b
D.) 0.7+0.4−0.2=0.9
B: c²/9
c²
(c/3)² is the same as ------'
9