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x in (-oo:+oo)
(-4/3)*x = -16/21 // + -16/21
(-4/3)*x-(-16/21) = 0
(-4/3)*x+16/21 = 0
16/21-4/3*x = 0 // - 16/21
-4/3*x = -16/21 // : -4/3
x = -16/21/(-4/3)
x = 4/7
x = 4/7
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