Question

1) Resolva as equações(calculos pfv):
a.4x+x=15
b.x+x-4+7=2
c.6y+7y-5y=14
d.10x-5x+2x=28

Answer 1

A) 4x+x=15
    5x=15
    x=15/5
    x=3

B)x+x-4+7=2
   2x=+2+4-7
   2x=+6-7
   2x=-1
    x=-1/2

 C)6y+7y-5y=14
     13y-5=14
     8y=14
      y=14/8 : 2
      y=7/4

D)10x-5x+2x=28
     12x-5x=28
     7x=28
     x=28/7    
     x=4