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x in (-oo:+oo)
13*(1/2)*x = 30 // - 30
13*(1/2)*x-30 = 0
13/2*x-30 = 0 // + 30
13/2*x = 30 // : 13/2
x = 30/13/2
x = 60/13
x = 60/13
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