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x in (-oo:+oo)
(3/8)*x-x+3/4 = (5/8)*(x+3) // - (5/8)*(x+3)
(3/8)*x-((5/8)*(x+3))-x+3/4 = 0
(-5/8)*(x+3)+(3/8)*x-x+3/4 = 0
(3*x)/8-5/8*(x+3)-x+3/4 = 0
(-5/8*4*8*(x+3))/(4*8)+(3*4*x)/(4*8)+(4*8*(-x))/(4*8)+(3*8)/(4*8) = 0
3*4*x-5/8*4*8*(x+3)+4*8*(-x)+3*8 = 0
24-8*x-32*x-60 = 0
24-40*x-60 = 0
-40*x-36 = 0
(-40*x-36)/(4*8) = 0
(-40*x-36)/(4*8) = 0 // * 4*8
-40*x-36 = 0
-40*x-36 = 0 // + 36
-40*x = 36 // : -40
x = 36/(-40)
x = -9/10
x = -9/10
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