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x in (-oo:+oo)
(1*x)/2 = 45 // - 45
(1*x)/2-45 = 0
x/2-45 = 0
1/2*x-45 = 0 // + 45
1/2*x = 45 // : 1/2
x = 45/1/2
x = 90
x = 90
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