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20 = (5*x)/11+15 // - (5*x)/11+15
20-((5*x)/11)-15 = 0
(-5/11)*x-15+20 = 0
5-5/11*x = 0 // - 5
-5/11*x = -5 // : -5/11
x = -5/(-5/11)
x = 11
x = 11
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