21=-x/7

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Solution for 21=-x/7 equation: 


x in (-oo:+oo)

21 = -x/7 // + -x/7

21-(-x/7) = 0

(1/7)*x+21 = 0

1/7*x+21 = 0 // - 21

1/7*x = -21 // : 1/7

x = -21/1/7

x = -147

x = -147

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