Step-by-step explanation:
<u>Our problem:</u>

How to solve?
Find the reciprocal (opposite) of 4/5, then multiply. Simplify if necessary.
<u>Find the reciprocal:</u>

<u>Multiply:</u>

<u>Simplify:</u>

5/6 is your answer.
-5 = 3/4x - 2
-5 + 2 = 3/4x
-3 = 3/4x
-3 / (3/4) = x
-3 * 4/3 = x
-12/3 = x
-4 = x <==
Simply divide 3 by 0.7,

Or ≈ 4.28571 which is ≈ 4 years.
Answer:
x = 25°
Step-by-step explanation:
3x + 2x + x + 30° = 180°
6x + 30° = 180°
6x = 150°
x =25°
=> 3x = 25 * 3 = 75°
=> 2x = 25 * 2 = 50°
=> x + 30° = 25° + 30° = 55°