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x in (-oo:+oo)
(1/2)*(x-6) = 15 // - 15
(1/2)*(x-6)-15 = 0
1/2*(x-6)-15 = 0
1/2*(x-6)-15 = 0
1/2*x-18 = 0
1/2*x-18 = 0
1/2*x-18 = 0 // + 18
1/2*x = 18 // : 1/2
x = 18/1/2
x = 36
x = 36
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