Question

como resolver as equações.
a) x+12=2x -5 b) 3,5x +2=2,9x -1 c) 3-3 (x-2)= (x- 4)

Answer 1

a) x+12=2x-5
    x-2x=-5-12
-x=-17x=17

b)3,5x+2=2,9x-1
3,5x-2,9x=-1 -2
0,6x=-3
x=-6/0,6
x=10

c)3-3x+6=x-4
-3x-x=-4-9
-4x=-13
-x=-13/4
-x=-3,25
x=3,25

Answer 2

a) x+12=2x-5                                            c)3-3(x-2)=(x-4)
    x-2x=-5-12                                               3-3x+6=x-4
    -x=-17 (-1)                                                 -3x-x=-4-3-6
     x=17                                                           -4x=-13  (-1)
                                                                         x=13/4
b)3,5x+2=2,9x-1                                                    
   3,5x-2,9x=-1-2
   0,6x=-3
        x= -3/0,6 
        x= - 5