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x in (-oo:+oo)
(1/2)*(x-50) = 105 // - 105
(1/2)*(x-50)-105 = 0
1/2*(x-50)-105 = 0
1/2*(x-50)-105 = 0
1/2*x-130 = 0
1/2*x-130 = 0
1/2*x-130 = 0 // + 130
1/2*x = 130 // : 1/2
x = 130/1/2
x = 260
x = 260
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