Answer:
1 + 5(77 - s) = 31
Step-by-step explanation:
Solve for s:

Put the value of s to the expression 1 + 5(77 -s):

Use PEMDAS:
P Parentheses first
E Exponents (ie Powers and Square Roots, etc.)
MD Multiplication and Division (left-to-right)
AS Addition and Subtraction (left-to-right)
