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x in (-oo:+oo)
(3/4)*(x-500) = (1/2)*x // - (1/2)*x
(3/4)*(x-500)-((1/2)*x) = 0
(3/4)*(x-500)+(-1/2)*x = 0
3/4*(x-500)-x/2 = 0
(3/4*2*(x-500))/2-x/2 = 0
3/4*2*(x-500)-x = 0
1/2*x-750 = 0
(1/2*x-750)/2 = 0
(1/2*x-750)/2 = 0 // * 2
1/2*x-750 = 0
1/2*x-750 = 0 // + 750
1/2*x = 750 // : 1/2
x = 750/1/2
x = 1500
x = 1500
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