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1.3*x+10*x+30/5 = 0.5 // - 0.5
1.3*x+10*x+30/5-0.5 = 0
11.3*x+5.5 = 0 // - 5.5
11.3*x = -5.5 // : 11.3
x = -5.5/11.3
x = -0.48672566
x = -0.48672566
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