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x in (-oo:+oo)
6*(2-3*x) = -78 // + 78
6*(2-3*x)+78 = 0
6*(2-3*x)+78 = 0
90-18*x = 0
90-18*x = 0
90-18*x = 0 // - 90
-18*x = -90 // : -18
x = -90/(-18)
x = 5
x = 5
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