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((7*x)/3)*y = 10 // - 10
((7*x)/3)*y-10 = 0
7/3*x*y-10 = 0 // + 10
7/3*x*y = 10 // : 7/3*y
x = 10/(7/3*y)
x = 30/7*y^-1
x = 30/7*y^-1
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