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((3*x)/11)*y = 7 // - 7
((3*x)/11)*y-7 = 0
3/11*x*y-7 = 0 // + 7
3/11*x*y = 7 // : 3/11*y
x = 7/(3/11*y)
x = 77/3*y^-1
x = 77/3*y^-1
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