Answer:
-6
Step-by-step explanation:
-18 - (-12)=-18+12
-18+12=-6
(I don’t understand what you mean by on & 5 but..)
The two negatives (the -(- ) cancel each other out and make a postive, so
-18 + 12 = -6
4x=32a
0 = x2 + 3x + 2
80%