Question

resolva as questões a) 12 x - 10 = 5x + 11 b) 2 (7 x + 2) + 12(x +1) = 2

Answer 1

a) 12x-10=5x+11
12x-5x=11+10
7x=21
x=21/3
x=7

b) 2(7x+2)+12(x+1)=2
14x+4+12x+12=2
26x+16=2
26x=2-16
26x=-14
x=-14/26
x= -7/13

Answer 2

a)
12 x - 10 = 5x + 11
12x - 5x = 11 + 10
7x = 21
x = 21/7
x = 3

b)
2.(7 x + 2) + 12.(x +1) = 2
14x + 4 + 12x + 12 = 2
14x +12x + 4 + 12 = 2
26x + 16 = 2
26x = 2 - 16
26x = - 14
x = - 14  (:2)
      --------
         26  (:2)

x = - 7
      -----
       13