(X+2)/5=4/(x+1)

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Solution for (X+2)/5=4/(x+1) equation: 


D( x )

x+1 = 0

x+1 = 0

x+1 = 0

x+1 = 0 // - 1

x = -1

x in (-oo:-1) U (-1:+oo)

(X+2)/5 = 4/(x+1) // - 4/(x+1)

(X+2)/5-(4/(x+1)) = 0

(X+2)/5-4*(x+1)^-1 = 0

(X+2)/5-4/(x+1) = 0

((X+2)*(x+1))/(5*(x+1))+(-4*5)/(5*(x+1)) = 0

(X+2)*(x+1)-4*5 = 0

X*x+X+2*x-18 = 0

(X*x+X+2*x-18)/(5*(x+1)) = 0

(X*x+X+2*x-18)/(5*(x+1)) = 0 // * 5*(x+1)

X*x+X+2*x-18 = 0

X+2*x-18 = 0 // - X-18

2*x = -(X-18) // : 2

x = (-(X-18))/2

x = (18-X)/2

x = (18-X)/2

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