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3*x+(18/4)*x+4/5 = 11 // - 11
3*x+(18/4)*x+4/5-11 = 0
15/2*x-51/5 = 0 // + 51/5
15/2*x = 51/5 // : 15/2
x = 51/5/15/2
x = 34/25
x = 34/25
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