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(9*x)/10 = (2*x)/5+5 // - (2*x)/5+5
(9*x)/10-((2*x)/5)-5 = 0
(9*x)/10+(-2/5)*x-5 = 0
1/2*x-5 = 0 // + 5
1/2*x = 5 // : 1/2
x = 5/1/2
x = 10
x = 10
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