Question

Solve 1.8x + 2.5 = 3.6

Answer 1

1.8x=1.1
x = (1.1/1.8)

Answer 2

the aim here is to 'leave x alone'

Answer 3

that is why we have to do some arithmetic operations(know some rules etc):
1.8x=3.6-2.5
1.8x=1.1
x=1.1/1.8
x=11/18
opposite side means reverse(operation),ex:if it was plus in left side it should go as minus to right side

Answer 4

11/18