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x in (-oo:+oo)
(-4/5)*x-(2/7) = x // - x
(-4/5)*x-x-(2/7) = 0
(-4/5)*x-x-2/7 = 0
-9/5*x-2/7 = 0 // + 2/7
-9/5*x = 2/7 // : -9/5
x = 2/7/(-9/5)
x = -10/63
x = -10/63
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