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y-120 = (-91/2)*(x+0) // - (-91/2)*(x+0)
y-((-91/2)*(x+0))-120 = 0
(91/2)*x+y-120 = 0
91/2*x+y-120 = 0 // - y-120
91/2*x = -(y-120) // : 91/2
x = (-(y-120))/91/2
x = 2/91*(120-y)
x = 2/91*(120-y)
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