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x in (-oo:+oo)
(-4/3)*x = 1/7 // - 1/7
(-4/3)*x-(1/7) = 0
(-4/3)*x-1/7 = 0
-4/3*x-1/7 = 0 // + 1/7
-4/3*x = 1/7 // : -4/3
x = 1/7/(-4/3)
x = -3/28
x = -3/28
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