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x in (-oo:+oo)
a-(x/8)-(3*x) = a+1/7 // - a+1/7
a-a-(x/8)-(3*x)-(1/7) = 0
a-a-(x/8)-3*x-1/7 = 0
-25/8*x-1/7 = 0 // + 1/7
-25/8*x = 1/7 // : -25/8
x = 1/7/(-25/8)
x = -8/175
x = -8/175
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