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y-12 = (-7/2)*(x+10) // - (-7/2)*(x+10)
y-((-7/2)*(x+10))-12 = 0
(7/2)*(x+10)+y-12 = 0
7/2*(x+10)+y-12 = 0
7/2*(x+10)+y-12 = 0
7/2*x+y-12+35 = 0
7/2*x+y+23 = 0
7/2*x+y+23 = 0
7/2*x+y+23 = 0 // - y+23
7/2*x = -(y+23) // : 7/2
x = (-(y+23))/7/2
x = -2/7*(y+23)
x = -2/7*(y+23)
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