-30-(-21)=x/6

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Solution for -30-(-21)=x/6 equation: 


x in (-oo:+oo)

21-30 = x/6 // - x/6

21-(x/6)-30 = 0

-1/6*x-9 = 0 // + 9

-1/6*x = 9 // : -1/6

x = 9/(-1/6)

x = -54

x = -54

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