2x-21=n/4

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Solution for 2x-21=n/4 equation: 


x in (-oo:+oo)

2*x-21 = n/4 // - n/4

2*x-(n/4)-21 = 0

2*x-1/4*n-21 = 0 // + -1/4*n-21

2*x = -(-1/4*n-21) // : 2

x = (-(-1/4*n-21))/2

x = (21-(-1/4*n))/2

x = (21-(-1/4*n))/2

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