The sum of 2.8 times of a number and 5 and 1 / 2 is equal to 4 times of 1.9

The sum of 2.8 times of a number and 5 and 1 / 2 is equal to 4 times of 1.9

Let this number be x, then:
2.8x+5 1/2=1.9*4
2.8x=7.6-5.5
x=2.1/2.8
x=0.75