exam Maths Puzzle Numerical Ability

I have not used this stuff in over 30 years, but I need to calculate x for:
x - y% = z, where z=100 and y% = 8.8% or .088. I know it is simple, but this old brain cannot seem to recall it.

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exam Other Question

Ted put $4000 in his savings account at Bank A. He put $6,000 in an account at Bank B that paid interest at twice the rate as Bank A. HIs total simple interest for the year was $640. What was the interest rate at each bank? please help me in solving this problem #155 4/3(3x-1)-2x=8/3
thanks!