If a + b - c = 2d, and if a - b + c =-4e, then a = Select the correct option:
A) 2(d + e) B) d – e C) (d + e)/2 D) d-2e E) e-d
Add both equations:   a + b - c = 2d   a - b + c =--4e   a+b-c+a-b+c=2d-e   2a=2d-4e   a=d-2e   Ans:d-2e
<result>D</result>
If a + b - c = 2d, and if a - b + c =-4e, then a =