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x in (-oo:+oo)
(1/2)*(10-(9*x)) = 3/2 // - 3/2
(1/2)*(10-(9*x))-(3/2) = 0
(1/2)*(10-9*x)-3/2 = 0
1/2*(10-9*x)-3/2 = 0
(1/2*2*(10-9*x))/2-3/2 = 0
1/2*2*(10-9*x)-3 = 0
7-9*x = 0
(7-9*x)/2 = 0
(7-9*x)/2 = 0 // * 2
7-9*x = 0
7-9*x = 0 // - 7
-9*x = -7 // : -9
x = -7/(-9)
x = 7/9
x = 7/9
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