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x in (-oo:+oo)
85 = (1/2)*(266-x) // - (1/2)*(266-x)
85-((1/2)*(266-x)) = 0
(-1/2)*(266-x)+85 = 0
85-1/2*(266-x) = 0
85-1/2*(266-x) = 0
1/2*x-48 = 0
1/2*x-48 = 0
1/2*x-48 = 0 // + 48
1/2*x = 48 // : 1/2
x = 48/1/2
x = 96
x = 96
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