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(2*2*x*y)/2 = 48 // - 48
(2*2*x*y)/2-48 = 0
2*x*y-48 = 0 // + 48
2*x*y = 48 // : 2*y
x = 48/(2*y)
x = 24*y^-1
x = 24*y^-1
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