Question

resolva as equações a seguir : a)2x+3x+9=8(6-x)
b)3(x-1)-(x-3)+5(x-2)=18
c)3x-2(4x-3)=2-3(x-1)
d)x/2 - 7 = x/4 +5

Answer 1

a) 5x + 9 = 48 - 8x
. 5x + 8x = 48-9
. 13x = 39
. x= 39/13
. X=3

Answer 2

a) 2X+3X+9=48-8X

2X+3X+8X=48-9

13X=39

X=39/13 = 3

b) 3X-3-X+3+5X-10=18

3X-X+5X=18+10

7X=28

X=28/7 = 4

c) 3X-8X+6=2-3X+3

3X-8X+3X=5-6

-2X=-1 . (-1)

2X=1

X=1/2

d) x/2-x/4=5+7

X/4=12

X=12.4 = 48