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x in (-oo:+oo)
(-4/7)*x-(1/5) = -107/35 // + -107/35
(-4/7)*x-(1/5)-(-107/35) = 0
(-4/7)*x-1/5+107/35 = 0
20/7-4/7*x = 0 // - 20/7
-4/7*x = -20/7 // : -4/7
x = -20/7/(-4/7)
x = 5
x = 5
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