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x in (-oo:+oo)
((1/7)*x+4)*(14*x+15) = 0
(1/7*x+4)*(14*x+15) = 0
( 1/7*x+4 )
1/7*x+4 = 0 // - 4
1/7*x = -4 // : 1/7
x = -4/1/7
x = -28
( 14*x+15 )
14*x+15 = 0 // - 15
14*x = -15 // : 14
x = -15/14
x in { -28, -15/14 }
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