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Y-50 = -((21/4)*(x-10)) // + (21/4)*(x-10)
(21/4)*(x-10)+Y-50 = 0
21/4*(x-10)+Y-50 = 0
21/4*(x-10)+Y-50 = 0
Y+21/4*x-105/2-50 = 0
Y+21/4*x-205/2 = 0
Y+21/4*x-205/2 = 0
Y+21/4*x-205/2 = 0 // - Y-205/2
21/4*x = -(Y-205/2) // : 21/4
x = (-(Y-205/2))/21/4
x = 4/21*(205/2-Y)
x = 4/21*(205/2-Y)
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