4x/5-21=-x/4

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Solution for 4x/5-21=-x/4 equation: 


x in (-oo:+oo)

(4*x)/5-21 = -x/4 // + -x/4

(4*x)/5-(-x/4)-21 = 0

(4*x)/5+(1/4)*x-21 = 0

21/20*x-21 = 0 // + 21

21/20*x = 21 // : 21/20

x = 21/21/20

x = 20

x = 20

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