-18-21r/-12

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Solution for -18-21r/-12 equation: 


r in (-oo:+oo)

-((21*r)/(-12))-18 = 0

(7/4)*r-18 = 0

7/4*r-18 = 0 // + 18

7/4*r = 18 // : 7/4

r = 18/7/4

r = 72/7

r = 72/7

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