Answer:
A= -10
Step-by-step explanation:
-0.4a + 3 = 7
-4/10a + 3 = 7
-2^2/2*5a + 3 = 7
-2^2-1/5a + 3 = 7
-2/5a + 3 = 7
(-2a) + 5 * 3 / 5 = 7
-2a + 15 = 5 * 7
-2a + 15 = 35
-2a + 15 - 15 = 35 - 15
-2a = 20
2a/2 = -20/2
A= 2^2 * 5/ 2
A= -(2^2-1 * 5)
A= - (2*5)
