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x in (-oo:+oo)
(3*(x-5))/2 = 5*x-18 // - 5*x-18
(3*(x-5))/2-(5*x)+18 = 0
(3*(x-5))/2-5*x+18 = 0
(3*(x-5))/2+(-5*2*x)/2+(2*18)/2 = 0
3*(x-5)-5*2*x+2*18 = 0
36-7*x-15 = 0
21-7*x = 0
(21-7*x)/2 = 0
(21-7*x)/2 = 0 // * 2
21-7*x = 0
21-7*x = 0 // - 21
-7*x = -21 // : -7
x = -21/(-7)
x = 3
x = 3
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