15 - 2( 3\(x\) + 1) = 11 \(\times\) 13 - 130
15 - 2(3\(x\) + 1) = 143 - 130
15 - 2(3\(x\) + 1) = 13
2(3\(x\) + 1) = 15 - 13
2(3\(x\) +1) = 2
3\(x\) + 1 = 2:2
3\(x\) + 1 =1
3\(x\) = 0
\(x\) = 0
15-2(3x+1)=11x13-130
15-2(3x+1)=143-130
15-2(3x+1)=13
2(3x+1)=15-13
2(3x+1)=2
3x+1=2:2
3x+1=1
3x=0
Vậy x=0
` @ L I N H `
15 - 2( 3 + 1) = 11 13 - 130
15 - 2(3 + 1) = 143 - 130
15 - 2(3 + 1) = 13
2(3 + 1) = 15 - 13
2(3 +1) = 2
3 + 1 = 2:2
3 + 1 =1
3 = 0
= 0