Răspuns :
Explicație pas cu pas:
3×(x+1)- 2×(x-1)=15
3x+3 - 2x-2=15| +2
3x+ 5- 2x=15|+2x
5x+5=15
5x=15-5
5x=10
x=10÷5
x=2
3×(b+1)- 2×(b-1)=15
3b+3 - 2x-2=15| +2
3b+ 5- 2x=15|+2x
5b+5=15
5x=15-5
5x=10
b=10÷5
b=2
Explicație pas cu pas:
3×(x+1)- 2×(x-1)=15
3x+3 - 2x-2=15| +2
3x+ 5- 2x=15|+2x
5x+5=15
5x=15-5
5x=10
x=10÷5
x=2
3×(b+1)- 2×(b-1)=15
3b+3 - 2x-2=15| +2
3b+ 5- 2x=15|+2x
5b+5=15
5x=15-5
5x=10
b=10÷5
b=2