Question

Resolve as equações:

a) 2. (x-2)+5. (2-x)=-3. (2x+2)
b) 2. (1-x)+1=3. (x-3)-2x
c) 5. (x+1)-3. (2x+1)=4. (5-x)

Answer 1

a)2.(x-2)+5.(2-x)=3.(2x+2)
2x-4+10-5x=-6x-6
2x-5x+6x=-6+4-10
2x+6x-5x=+4-6-10
8x-5x=+4-16
3x=-12
x=-12
3
x=-4

b)2.(1-x)+1=3.(x-3)-2x
2-2x+1=3x-9-2x
-2x-3x+2x=-9-1-2
-5x+2x=-10-2
-3x=-12.(-1)
3x=12
3
x=4

c)5.(x+1)-3.(2x+1)=4.(5-x)
5x+5-6x-3=20-4x
5x-6x+4x=20-5+3
5x+4x-6x=20+3-5
9x-6x=23-5
3x=18
x=18
3
x=6

Answer 2

a)2x-4+10-5x=-12x-12
2x-5x+12x=4-10-12
9x=-6        x=-6/9

b)2-2x+1=3x-9-2x
2x-3x+2x=-2-1-9
1x=-12    x=-12/1    x=-12

c)5x+5-6x+3=20-4x
5x-6x+4x=-5-3+20
3x=18    x=18/3    x=6

acho q é assim...espero ter ajudado.