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(1/3)*(2*x-15)+(1/3)*x+31/2 = 0
1/3*(2*x-15)+x/3+31/2 = 0
(1/3*2*3*(2*x-15))/(2*3)+(2*x)/(2*3)+(3*31)/(2*3) = 0
1/3*2*3*(2*x-15)+2*x+3*31 = 0
6*x-30+93 = 0
6*x+63 = 0
(6*x+63)/(2*3) = 0
(6*x+63)/(2*3) = 0 // * 2*3
6*x+63 = 0
6*x+63 = 0 // - 63
6*x = -63 // : 6
x = -63/6
x = -21/2
x = -21/2
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