Question

Preciso das contas, pfv!!

Answer 1

7) -3-2×=8+4×
-2×-4×=9+3
-6×=12
×= -2

8)4×+6=12+2×
4×-2×=12-6
2×=6
×=3

9) 9×-20=30-5
9×-20=25
9×=25+20
9×=45
×=5

10) 2-6×=3×+12-5×
2-6×=-8×+12
-6×+8×=12-2
2×=10
×=5

11) 3×-40=×-42
3×-×=-42+40
2×=-2
×=1

12) 20+8×=19-23
20+8×=42
8×=42-20
8×=22
×= 11
4

espero ter ajudado e bons estudos!!

Answer 2

7) x=6
8) x=3
9) x=5
10) x= 5
7

11) x= 41
12) x= -3

espero ter ajudado.