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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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