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(2/3)*x-15 = 5*y // - 5*y
(2/3)*x-(5*y)-15 = 0
(2/3)*x-5*y-15 = 0
2/3*x-5*y-15 = 0 // + -5*y-15
2/3*x = -(-5*y-15) // : 2/3
x = (-(-5*y-15))/2/3
x = 3/2*(15-(-5*y))
x = 3/2*(15-(-5*y))
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