Question

Calcule o valor de x
a) 2. x = 6
b) 3. x = 9
c) 4. x = 20
d) 5. x - 10 = 60
e) 7. x + 20 = 90
f) 8. x - 30 = 50

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Answer 1

a) 2.x= 6
2x = 6
x = 6/2
x = 3
b) 3.x= 9
3x = 9
x = 9/3
x= 3
c) 4.x = 20
4x = 20
x= 20/4
x= 5
d) 5.x-10= 60
5x - 10 = 60
5x = 60 + 10
5x = 70
x = 70/5
x= 14
e) 7.x + 20 = 90
7x = 90 - 20
7x = 70
x = 70/7
x= 10
f) 8.x - 30 = 50
8x = 50 + 30
8x = 80
x = 80/8
x = 10