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(-9/10)*x+9 = y // - y
(-9/10)*x-y+9 = 0
9-9/10*x-y = 0 // - 9-y
-9/10*x = -(9-y) // : -9/10
x = (-(9-y))/(-9/10)
x = -10/9*(y-9)
x = -10/9*(y-9)
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