A=16.35
B=21.5. ................
Subtract the 18 from the 78 then multiply both sides by -1, then divide by 5.
Answer:
x=-5
Step-by-step explanation:
opening the bracket on the LHS, we have
-8x-40= -3x+x-7-3
-8x-40= -2x-10
collecting like terms
-8x+2x= -10+40
-6x= 30
divide both sides by -6
x= -5
A pentagon and a abstract shape