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x in (-oo:+oo)
(1/5)*(1-(4*x)) > -7 // + 7
(1/5)*(1-(4*x))+7 > 0
(1/5)*(1-4*x)+7 > 0
1/5*(1-4*x)+7 > 0
1/5*(1-4*x)+7 > 0
36/5-4/5*x > 0
36/5-4/5*x > 0
36/5-4/5*x > 0 // - 36/5
-4/5*x > -36/5 // : -4/5
x < -36/5/(-4/5)
x < 9
(-oo:9) (9:+oo) 36/5-4/5*x + -
x in (-oo:9)
(-oo:9)
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