Question

Resolva as equações :
a) x + 9 = 21
b) 3x -5 = 2x + 8
c) 5x + 12 = 2x +17
d) 3( 2x - 4 ) -2 ( x + 8 ) = 4 (-x + 9 ) – 5
e) 3 ( x – 2) – ( 1 – x ) = 13

Answer 1

a) x+9=21 b) 3x-5=2x+8 c) 5x+12=2x+17

x=21-9 3x-2x=+8+5 5x-2x=+17'12

x=12 1x=13 3x=5

x=13/1 x=13 x=5/3

d)3(2x-4)-2(x+8)=4(-x+9)-5 e) 3(x-2)-(1-x)=13

6x-12 -2x+16=-4x+36-5 3x-6-1+x=13

6x-2x+4x=+36-5+12-16 3x+x=13+6+1

8x=27 2x=20

x=27/8 x=20/2 x=10