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(1/4)*(x+5)+(1/3)*(3*x+9) = 0
1/4*(x+5)+1/3*(3*x+9) = 0
1/4*(x+5)+1/3*(3*x+9) = 0
5/4*x+17/4 = 0
5/4*x+17/4 = 0
5/4*x+17/4 = 0 // - 17/4
5/4*x = -17/4 // : 5/4
x = -17/4/5/4
x = -17/5
x = -17/5
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