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D( x )
x+1 = 0
5*x+5 = 0
7*x+7 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
5*x+5 = 0
5*x+5 = 0
5*x+5 = 0 // - 5
5*x = -5 // : 5
x = -5/5
x = -1
7*x+7 = 0
7*x+7 = 0
7*x+7 = 0 // - 7
7*x = -7 // : 7
x = -7/7
x = -1
x in (-oo:-1) U (-1:+oo)
(7*x)/(7*x+7) = (-4*x)/(5*x+5)+(9*x-72)/(x+1) // - (-4*x)/(5*x+5)+(9*x-72)/(x+1)
(7*x)/(7*x+7)-((-4*x)/(5*x+5))-((9*x-72)/(x+1)) = 0
(7*x)/(7*x+7)+4*x*(5*x+5)^-1-((9*x-72)/(x+1)) = 0
(7*x)/(7*x+7)+(4*x)/(5*x+5)+(-1*(9*x-72))/(x+1) = 0
(7*x*(5*x+5)*(x+1))/((7*x+7)*(5*x+5)*(x+1))+(4*x*(7*x+7)*(x+1))/((7*x+7)*(5*x+5)*(x+1))+(-1*(9*x-72)*(7*x+7)*(5*x+5))/((7*x+7)*(5*x+5)*(x+1)) = 0
7*x*(5*x+5)*(x+1)+4*x*(7*x+7)*(x+1)-1*(9*x-72)*(7*x+7)*(5*x+5) = 0
63*x^3-315*x^3+126*x^2+1890*x^2+63*x+4725*x+2520 = 0
2016*x^2-252*x^3+4788*x+2520 = 0
2016*x^2-252*x^3+4788*x+2520 = 0
252*(8*x^2-x^3+19*x+10) = 0
8*x^2-x^3+19*x+10 = 0
{ 1, -1, 2, -2, 5, -5, 10, -10 }
1
x = 1
8*x^2-x^3+19*x+10 = 36
1
-1
x = -1
8*x^2-x^3+19*x+10 = 0
-1
x+1
9*x-x^2+10
8*x^2-x^3+19*x+10
x+1
x^3+x^2
9*x^2+19*x+10
-9*x^2-9*x
10*x+10
-10*x-10
0
9*x-x^2+10 = 0
DELTA = 9^2-(-1*4*10)
DELTA = 121
DELTA > 0
x = (121^(1/2)-9)/(-1*2) or x = (-121^(1/2)-9)/(-1*2)
x = -1 or x = 10
x in { -1, 10, -1}
252*(x+1)^2*(x-10) = 0
(252*(x+1)^2*(x-10))/((7*x+7)*(5*x+5)*(x+1)) = 0
(252*(x+1)^2*(x-10))/((7*x+7)*(5*x+5)*(x+1)) = 0 // * (7*x+7)*(5*x+5)*(x+1)
252*(x+1)^2*(x-10) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-10 )
x-10 = 0 // + 10
x = 10
x in { -1}
x = 10
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