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