book Maths Puzzle Numerical Ability

|7-1/2x|=-3 how do you solve this absolute value?

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book Other Question

What is Sn of the geometric series with a1 = 4, an = 256 and n = 4? My daughter is having problems with 2 step inequalities when it involves a fraction. Please help solve -x/5 + 2 >3. Thank you very much.