42-(4b/12)=30

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Solution for 42-(4b/12)=30 equation: 


b in (-oo:+oo)

42-((4*b)/12) = 30 // - 30

42-((4*b)/12)-30 = 0

(-1/3)*b-30+42 = 0

12-1/3*b = 0 // - 12

-1/3*b = -12 // : -1/3

b = -12/(-1/3)

b = 36

b = 36

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