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8*x+5 = (1/2)*x+50 // - (1/2)*x+50
8*x-((1/2)*x)-50+5 = 0
8*x+(-1/2)*x-50+5 = 0
15/2*x-45 = 0 // + 45
15/2*x = 45 // : 15/2
x = 45/15/2
x = 6
x = 6
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