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x in (-oo:+oo)
(2*(x-3))/5 = 12 // - 12
(2*(x-3))/5-12 = 0
(2*(x-3))/5+(-12*5)/5 = 0
2*(x-3)-12*5 = 0
2*x-66 = 0
(2*x-66)/5 = 0
(2*x-66)/5 = 0 // * 5
2*x-66 = 0
2*x-66 = 0 // + 66
2*x = 66 // : 2
x = 66/2
x = 33
x = 33
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