4. (x-3) - x = 3
4x - 12 - x = 3
3x - 12 = 3
3x = 3+12
3x = 15
x= 15:3
x = 5
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4. (x-3) - x = 3
4x - 12 - x = 3
3x - 12 = 3
3x = 3+12
3x = 15
x= 15:3
x = 5
2nhan(x-4)+4nhan(x-3)-x+1=3nhan(2x-3)-7
tim x biet : 3^x+1+ 3^x+2 +3^x+3
tim x biet (x^3+5)(x^3+10)(x^3+15)(x^3+30)<0
tim x biet 3(x-5)-2(2x-3)+ 3(6-x)=17
tim x biet 3(x-5)-2(2x-3) 3(6-x)=17
tim x biet: (x+1)+(x-3)=x-2
tim x biet x3=x
tim x biet /x-1/+/x+3/=4
tim x biet 1/2(x-2/3)-1/3(2x-3)=x+1/2