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4*x+7*y = 161/11 // - 161/11
4*x+7*y-(161/11) = 0
4*x+7*y-161/11 = 0
4*x+7*y-161/11 = 0 // - 7*y-161/11
4*x = -(7*y-161/11) // : 4
x = (-(7*y-161/11))/4
x = (161/11-(7*y))/4
x = (161/11-(7*y))/4
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