7=-r/9

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Solution for 7=-r/9 equation: 


r in (-oo:+oo)

7 = -r/9 // + -r/9

7-(-r/9) = 0

(1/9)*r+7 = 0

1/9*r+7 = 0 // - 7

1/9*r = -7 // : 1/9

r = -7/1/9

r = -63

r = -63

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