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x in (-oo:+oo)
(-1/2)*x-(5/7) = -1/5 // + -1/5
(-1/2)*x-(5/7)-(-1/5) = 0
(-1/2)*x-5/7+1/5 = 0
-1/2*x-18/35 = 0 // + 18/35
-1/2*x = 18/35 // : -1/2
x = 18/35/(-1/2)
x = -36/35
x = -36/35
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