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(1/3)*(2*x+10)+5.5*x = 0
1/3*(2*x+10)+5.5*x = 0
1/3*(2*x+10)+5.5*x = 0
6.16666667*x+10/3 = 0
6.16666667*x+10/3 = 0
6.16666667*x+10/3 = 0 // - 10/3
6.16666667*x = -10/3 // : 6.16666667
x = -10/3/6.16666667
x = -0.54054054
x = -0.54054054
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