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x in (-oo:+oo)
38 = (1/2)*(180-x) // - (1/2)*(180-x)
38-((1/2)*(180-x)) = 0
(-1/2)*(180-x)+38 = 0
38-1/2*(180-x) = 0
38-1/2*(180-x) = 0
1/2*x-52 = 0
1/2*x-52 = 0
1/2*x-52 = 0 // + 52
1/2*x = 52 // : 1/2
x = 52/1/2
x = 104
x = 104
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