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36x-6x=27-24+7
30x=10
x=1/3
9(4x-3) - 6(x-4) = 7
(9 . 4x) (9 . -3) - (-6 . x) (-6 . -4) = 7
36x-27 -6x+24 = 7
<=>
36x-6x = 7+27-24
30x = 10
<=>
x = 10/30
x =1/3