3-1/2r=12

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Solution for 3-1/2r=12 equation: 


r in (-oo:+oo)

3-((1/2)*r) = 12 // - 12

3-((1/2)*r)-12 = 0

(-1/2)*r-12+3 = 0

-1/2*r-9 = 0 // + 9

-1/2*r = 9 // : -1/2

r = 9/(-1/2)

r = -18

r = -18

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