Question

Resolva as seguintes equações: a:3x+2=4x+9
b: 2m-4+12=3m-4+2
c: 2 (x+2)= 12

Answer 1

a) 3x+2=4x+9

3x-4x=9-2

-x=7 .(-1)

x=-7

b) 2m-4+12=3m-4+2

2m-3m=-4+4+2-12

-m=-10

m=10

c) 2(x+2)=12

2x+2.2=12

2x+4=12

2x=12-4

2x=8

x=4

Answer 2

a-

$3x - 4x + 2 - 9 = 0$

$- x - 7 = 0$

$- x = 7 \: ( - 1)$

$x = - 7$

b-

$3m - 2m = - 4 + 4 + 12 - 2$

$m = 10$

c-

$x + 2 = \frac{12}{2}$

$x = 6 - 2$

$x = 4$