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(2*x)/y = 7*y+4 // - 7*y+4
(2*x)/y-(7*y)-4 = 0
(2*x)/y-7*y-4 = 0
2*x*y^-1-7*y-4 = 0 // + -7*y-4
2*x*y^-1 = -(-7*y-4) // : 2*y^-1
x = (-(-7*y-4))/(2*y^-1)
x = (4-(-7*y))/(2*y^-1)
x = (4-(-7*y))/(2*y^-1)
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