-21-(-4)=x/9

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Solution for -21-(-4)=x/9 equation: 


x in (-oo:+oo)

4-21 = x/9 // - x/9

4-(x/9)-21 = 0

-1/9*x-17 = 0 // + 17

-1/9*x = 17 // : -1/9

x = 17/(-1/9)

x = -153

x = -153

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