Question

porfavor me ajudem nestas cinco questoes 23x-16=14-17x , x+30=40 , 30-20+2x=10 , 3x-10+13=-2x+28 , 20x-30=40+30-20

Answer 1

23x - 16 = 14 - 17x
23x + 17x = 14 + 16
40x = 30 (:10)
x = 3/4 
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x + 30 = 40 
x = 40 - 30
x = 10
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30 - 20 + 2x = 10 
10 + 2x = 10
2x = 10 - 10
2x = 0
x = 0/2
x = 0
-----------------------------------
3x - 10 + 13= - 2x + 28 
3x + 3 = - 2x + 28
3x + 2x = 28 - 3
5x = 25
x = 25/5
x = 5
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20x - 30 = 40 + 30 - 20
20x - 30 = 70 - 20
20x - 30 = 50
20x = 50 + 30
20x = 80
x = 80/20
x = 4