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x in (-oo:+oo)
(-1/2)*x-(4/5) = -8/7 // + -8/7
(-1/2)*x-(4/5)-(-8/7) = 0
(-1/2)*x-4/5+8/7 = 0
12/35-1/2*x = 0 // - 12/35
-1/2*x = -12/35 // : -1/2
x = -12/35/(-1/2)
x = 24/35
x = 24/35
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