(5.3a−0.8)−(1.6−4.7a)=2a−(a−0.3)

Answer 1

(5.3a−0.8)−(1.6−4.7a)=2a−(a−0.3)
5.3a - 0.8 - 1.6 + 4.7a = 2a - a + 0.3
10a - 2.4 = a + 0.3
Now finish it off.