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Solve for x in log 5–2+log(2x+10)=log(x–4) 
 

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log 5 − 2 log10 + log(2x+10) = log(x−4)       
Log (5/102  × (2x +10) ) =log(x−4)                
x/10 + ½ = x − 4
−9/10x−9/
        x = −9 ×  10
                2      −9
           =5

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