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13*x = (1/2)*x+50 // - (1/2)*x+50
13*x-((1/2)*x)-50 = 0
13*x+(-1/2)*x-50 = 0
25/2*x-50 = 0 // + 50
25/2*x = 50 // : 25/2
x = 50/25/2
x = 4
x = 4
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