Question

trabalho de matemática preciso com a conta qual é o resultado das equações
1) x+3= 40
2)30-20+2x=40
3)3x-40+13=-2x+28
4)20x-30=80+30-20
5)-5x+45-89=-90+41
6)10x-20=40+50
7)20-80+2x=10
8)19+2x-13=10-20
9)10x-12+10=+18-20
10)13x-43-25=-7x+12

Answer 1

Boa tarde

1) x+3= 40, x = 40 - 3 = 37

2) 30-20+2x=40, 2x = 40 - 30 + 20, x = 20 - 15 + 10 = 15

3)3x-40+13=-2x+28, 5x = 28 + 40 - 13 = 55, x = 11

4)20x-30=80+30-20 , 20x - 30 = 90, 20x = 120, x = 6 

5)-5x+45-89=-90+41, 5x = 45 - 89 + 90 - 41 = 5, x = 1

6) 10x-20=40+50, 10x = 20 + 90 = 110, x = 11

7) 20-80+2x=10 , 2x = 10 - 20 + 80 = 70, x = 35 

8)19+2x-13=10-20,  2x = -10 - 19 + 13 = -16, x = -8

9)10x-12+10=+18-20, 10x = 18 - 20+12- 10 = 0, x = 0 

10)13x-43-25=-7x+12 , 13x + 7x = 12 + 43 + 25, 20x = 80 , x = 4