(-3.4x+4.7)-(3+2.9x)=
distribute
-3.4x +4.7 - 3 -2.9x=
combine like terms
-3.4x -2.9x +4.7 -3
-6.3x+1.7
First you need to remove the parenthesis ,and then combine or put together the like terms .Then after doing this you can find the difference:
-3.4x+4.7 - 3+2.9x
Next Simplify : -3.4x+4.7-3-2.9x:
You'll get a final answer of : --6.3x+1.7