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Two numbers have a sum of 70, and 5 times the first number minus the second number 
is equal to 26. What are the two numbers?
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If x is the first number, then (70-x) is the second number.
Write an equation connecting the two numbers as you read the problem
    5x - (70-x) = 26     (1)
Simlify it and find x
    5x - 70 + x = 26
    5x + x = 26 + 70
       6x  =   96
        x  = 96/6 = 16.
ANSWER.  The numbers are 16 and 70-16 = 54.
CHECK.  Left side of equation (1) is  5*16 - 54 = 80 - 54 = 26.    ! Correct !
Solved.