Answer:
-1.7x-3
Step-by-step explanation:
-4.2x+2.5x= -1.7x
you can add these two because they both have the same variable (x in this case) you cant add a number with a variable with a whole number, its like mixing a burger with a pizza, they are completely different things.
3+(-6)= -3
if you are wondering why 6 is negative, its because in front of it there is a negative sign, even if that was meant to show that you had to subtract.
now, because (stated before) you cannot add a variable with a whole number, the equation would end up like this
-1.7x-3
