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y-25 = (5/3)*(x-30) // - (5/3)*(x-30)
y-((5/3)*(x-30))-25 = 0
(-5/3)*(x-30)+y-25 = 0
y-5/3*(x-30)-25 = 0
y-5/3*(x-30)-25 = 0
y-5/3*x-25+50 = 0
y-5/3*x+25 = 0
y-5/3*x+25 = 0
y-5/3*x+25 = 0 // - y+25
-5/3*x = -(y+25) // : -5/3
x = (-(y+25))/(-5/3)
x = 3/5*(y+25)
x = 3/5*(y+25)
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