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y-30 = (1/4)*(x-160) // - (1/4)*(x-160)
y-((1/4)*(x-160))-30 = 0
(-1/4)*(x-160)+y-30 = 0
y-1/4*(x-160)-30 = 0
y-1/4*(x-160)-30 = 0
y-1/4*x-30+40 = 0
y-1/4*x+10 = 0
y-1/4*x+10 = 0
y-1/4*x+10 = 0 // - y+10
-1/4*x = -(y+10) // : -1/4
x = (-(y+10))/(-1/4)
x = 4*(y+10)
x = 4*(y+10)
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