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Y+9 = (9/4)*(x-7) // - (9/4)*(x-7)
Y-((9/4)*(x-7))+9 = 0
(-9/4)*(x-7)+Y+9 = 0
Y-9/4*(x-7)+9 = 0
Y-9/4*(x-7)+9 = 0
Y-9/4*x+9+63/4 = 0
Y-9/4*x+99/4 = 0
Y-9/4*x+99/4 = 0
Y-9/4*x+99/4 = 0 // - Y+99/4
-9/4*x = -(Y+99/4) // : -9/4
x = (-(Y+99/4))/(-9/4)
x = 4/9*(Y+99/4)
x = 4/9*(Y+99/4)
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