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x in (-oo:+oo)
(4/3)*(7-x) = 12 // - 12
(4/3)*(7-x)-12 = 0
4/3*(7-x)-12 = 0
4/3*(7-x)-12 = 0
-4/3*x-8/3 = 0
-4/3*x-8/3 = 0
-4/3*x-8/3 = 0 // + 8/3
-4/3*x = 8/3 // : -4/3
x = 8/3/(-4/3)
x = -2
x = -2
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