book Maths Puzzle Numerical Ability

3/2y-3/2y+4

i need to reduce each answer to lowest terms

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book Other Question

im not sure if this is algebra two or trig stuff but my teacher didn't explain it. it just says find the value. [[-3]] what do the double brackets mean? I need help
(x^2+2x)^2-5(x^2+2x)+6=0

and

x^1/2-11x^1/4+30

and

6x^3/5-24=0