-21-(-23)=x/7

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Solution for -21-(-23)=x/7 equation: 


x in (-oo:+oo)

23-21 = x/7 // - x/7

23-(x/7)-21 = 0

2-1/7*x = 0 // - 2

-1/7*x = -2 // : -1/7

x = -2/(-1/7)

x = 14

x = 14

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