1) -2x – 5x – 18 x =?

-2x -5x-18x
= -x(2+5+18)
= -x(25)
= -25x<===answer

- 25 x

-25x = 0

x = 0/-25

x = 0

-25x

because there all like terms ( all have an x on them) its easy.
-2x - 5x would be -7. -7x - 18x would be -25x
so the answer is -25x

x(-2-5-18)=-25x

-2x - 5x - 18x
= -7x - 18x
= -25x

first off you have to know what y equals
so it should look like
y=(-2x)-5x-18
and you have to know what y equals or its impossible to find x

-25x

They are all like terms, so it's just -25x