Answer:
not an answer but how do you attach images because it would be more useful
Step-by-step explanation:
Answer:
-31
Step-by-step explanation:
(2×x) - (2×5) = (3×x) + (3×7)
2x-10 = 3x+21
2x-3x = 21+10
-x = 31
therefore, x = -31
Answer:

Step-by-step explanation:
25= r•r•8 ⇔ 25/8 = r²
then

No it does not affect the sum because they have the same sign so it wouldn't make a difference