7(2r-2)/5=7r-4/4

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Solution for 7(2r-2)/5=7r-4/4 equation: 


r in (-oo:+oo)

(7*(2*r-2))/5 = 7*r-(4/4) // - 7*r-(4/4)

(7*(2*r-2))/5-(7*r)+4/4 = 0

(7*(2*r-2))/5-7*r+4/4 = 0

(7*(2*r-2))/5-7*r+1 = 0

(7*(2*r-2))/5+(-7*5*r)/5+(1*5)/5 = 0

7*(2*r-2)-7*5*r+1*5 = 0

5-21*r-14 = 0

-21*r-9 = 0

(-21*r-9)/5 = 0

(-21*r-9)/5 = 0 // * 5

-21*r-9 = 0

-21*r-9 = 0 // + 9

-21*r = 9 // : -21

r = 9/(-21)

r = -3/7

r = -3/7

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