Question

a)3×=90 b)2x+10=70 c)2x+80=3x d)x+50=3x+20 alguém saberia como resolver.

Answer 1

a)3x=90
   x=90/3
   x=30

b)2x+10=70
   2x=70-10
   2x=60
   x=60/2 
   x=30

c)2x+80=3x
   2x-3x=-80
   -x=-80(-1)
   x=80

d)x+50=3x+20
   x-3x=20-50
   -2x=-30(-1)
   2x=30
   x=30/2
   x=15

Answer 2

a)
3×=90
x = 90/3
x = 30
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b)
2x+10=70
2x = 70 - 10
2x = 60
x = 60/2
x = 30
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
c)
2x + 80 = 3x
80 = 3x - 2x
80 = x
x = 80
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
d)
x + 50 = 3x + 20 
50 - 20 = 3x - x
30 = 2x
2x = 30
x = 30/2
x = 15

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