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Y-128 = (-20/11)*x+0 // - (-20/11)*x+0
Y-((-20/11)*x)-128+0 = 0
Y+(20/11)*x-128 = 0
Y+20/11*x-128 = 0 // - Y-128
20/11*x = -(Y-128) // : 20/11
x = (-(Y-128))/20/11
x = 11/20*(128-Y)
x = 11/20*(128-Y)
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