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x in (-oo:+oo)
(-1/2)*(x-6) = 3*x // - 3*x
(-1/2)*(x-6)-(3*x) = 0
(-1/2)*(x-6)-3*x = 0
-1/2*(x-6)-3*x = 0
-1/2*(x-6)-3*x = 0
3-7/2*x = 0
3-7/2*x = 0
3-7/2*x = 0 // - 3
-7/2*x = -3 // : -7/2
x = -3/(-7/2)
x = 6/7
x = 6/7
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