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15*x+20/4 = 3*y+6/5 // - 3*y+6/5
15*x-(3*y)+20/4-(6/5) = 0
15*x-3*y+20/4-6/5 = 0
15*x-3*y+19/5 = 0 // - 19/5-3*y
15*x = -(19/5-3*y) // : 15
x = (-(19/5-3*y))/15
x = (-(19/5-3*y))/15
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