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