Answer:
x>−1
Explanation:
−2.8x+5.6<8.4 
Subtract 5.6 from both sides. 
−2.8x<8.4−5.6 
Subtract 5.6 from 8.4 to get 2.8. 
−2.8x<2.8 
Divide both sides by −2.8. Since −2.8 is negative, the inequality direction is changed. 
x> −2.8 / −2.8 
Divide 2.8 by −2.8 to get −1. 
x>−1