Easy buddy...
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Step (1)
I choose a number which is x
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Step (2)
Multiplies by 90 :

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Step (3)
Adds up to -23 :

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And we're done.
Thanks for watching buddy good luck.
♥️♥️♥️♥️♥️
Answer:
s = -7.8
Step-by-step explanation:
from the question 12=10(s+4)+50
<u>first step</u>
open the bracket and evaluate for the value of s
12=10(s+4)+50
12 = 10s + 40 + 50
12 = 10s + 90
collect or combine the like terms
12-90 = 10s
-78 = 10s
divide both side by 10
-78/10 = 10s/10
-7.8 = s
therefor s = -7.8