66,098 rounded to the nearest ten thousands place is 70,000.
Note the equal sign. What you do to one side, you do to the other. Do the opposite of PEMDAS.
First, add 10 to both sides
-6 (+10) = n/2 - 10 (+10)
10 - 6 = n/2
4 = n/2
Next, isolate the n. Multiply 2 to both sides
4(2) = n/2(2)
n = 4(2)
n = 8
8 is your answer
hope this helps
Combine all like terms and use inequality as = sign
5c-20 <15c + 10
Add 20 to each side
5c< 15c + 30
Subtract 15c from each side
-10c < 30
Divide each side by -10
c < -3