How do you solve #-2.5x+2.8=-4.5#?
x = 2.92
to solve equations of this type you collect the terms with the variable in them to one side of the equation , usually the left hand side and the constants to the other side.
-2.5x + 2.8 = - 4.5 becomes
-2.5x = -4.5 - 2.8