(4-1)/(r-7)=-3/5

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Solution for (4-1)/(r-7)=-3/5 equation: 


D( r )

r-7 = 0

r-7 = 0

r-7 = 0

r-7 = 0 // + 7

r = 7

r in (-oo:7) U (7:+oo)

(4-1)/(r-7) = -3/5 // + -3/5

(4-1)/(r-7)-(-3/5) = 0

(4-1)/(r-7)+3/5 = 0

3/(r-7)+3/5 = 0

(3*5)/(5*(r-7))+(3*(r-7))/(5*(r-7)) = 0

3*(r-7)+3*5 = 0

3*r-6 = 0

(3*r-6)/(5*(r-7)) = 0

(3*r-6)/(5*(r-7)) = 0 // * 5*(r-7)

3*r-6 = 0

3*r-6 = 0 // + 6

3*r = 6 // : 3

r = 6/3

r = 2

r = 2

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