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Answers (2)
I assume that you mean:
... L * (y^2) - 2 * L = 7
or L * [ y^2 - 2 ] = 7
or y^2 - 2 = 7/L
or y^2 = 2 + 7/L
or y = ± √ (2 + 7/L)
assuming that you mean "the absolute value of y squared minus 2 is equal to 7"
y ^ 2 - 2 = 7
y ^ 2 = 7 + 2
y ^ 2 = 9
(i can't write the square root symbol, sorry)
y = 3