4+5(7-x)/9=-1

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Solution for 4+5(7-x)/9=-1 equation: 


x in (-oo:+oo)

(5*(7-x))/9+4 = -1 // + 1

(5*(7-x))/9+1+4 = 0

(5*(7-x))/9+(1*9)/9+(4*9)/9 = 0

5*(7-x)+1*9+4*9 = 0

36-5*x+44 = 0

80-5*x = 0

(80-5*x)/9 = 0

(80-5*x)/9 = 0 // * 9

80-5*x = 0

80-5*x = 0 // - 80

-5*x = -80 // : -5

x = -80/(-5)

x = 16

x = 16

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