Question

rezolvati ecuatiile
2x+7=15
3x-11=21
5+2(x-1)=12
3(x-3)-8=20
15-4(x+1)=10

Answer 1

•2x+7=15
2x=15-7=8
2x=8
x=8supra2
x=4
•3x-11=21
3x=21-11
3x=10
x=10supra3
•5+2(x-1)=12
5+2x-1=12
2x=12-5+1
2x=6
x=6supra2
x=3
•3(x-3)-8=20
3x-6-8=20
3x=20+6+8
3x=34
x=34supra3
•15-4(x+1)=10
15-4x+4=10
4x=10-15-4
4x=-9
x=-9supra4
Sper ca te-am ajutat.

Answer 2

$2x+7=15 \\ 2x=15-7 \\ 2x=8 \\ x= \frac{8}{2} \\ x=4 \\ \\ 3x-11=21 \\ 3x=21+11 \\ 3x=32 \\ x= \frac{32}{3}$

$5+2(x-1)=12 \\ 5+2x-2=12 \\ 2x=12-5+2 \\ 2x=9 \\ x= \frac{9}{2} \\ \\ 3(x-3)-8=20 \\ 3x-9-8=20 \\ 3x=20+9+8 \\ 3x=37 \\ x= \frac{37}{3}$

$15-4(x+1)=10 \\ 15-4x-4=10 \\ -4x=10-15+4 \\ -4x=-1 \\ x= \frac{1}{4}$