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x in (-oo:+oo)
(-2/3)*(x-4) = 1/6 // - 1/6
(-2/3)*(x-4)-(1/6) = 0
(-2/3)*(x-4)-1/6 = 0
-2/3*(x-4)-1/6 = 0
(-2/3*6*(x-4))/6-1/6 = 0
-2/3*6*(x-4)-1 = 0
15-4*x = 0
(15-4*x)/6 = 0
(15-4*x)/6 = 0 // * 6
15-4*x = 0
15-4*x = 0 // - 15
-4*x = -15 // : -4
x = -15/(-4)
x = 15/4
x = 15/4
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