Question

Resolva as Equações

A) - 2x + 7 = - 4x - 4

B) 15x = 8 + 20x

C) 3 (x + 2) + 5 = x + 12

Answer 1

a)-2x+7=-4x-4
-2x+4x=-4-7
2x=-11
x=-11/2

b)15x=8+20x
15x-20x=8
-5x=8 .(-1)
5x=-8
x=-8/5

c)3(x+2)+5=x+12
3x+6+5=x+12
3x-x=12-11
2x=1
x=1/2 ou 0,5

Answer 2

A) -2x + 7 = -4x - 4
-2x + 4x = -4 - 7
2x = -11
x = -11/2

B) 15x = 8 + 20x
15x - 20x = 8
-5x = 8
x = -8/5

C) 3 (x + 2) + 5 = x + 12
3x + 6 + 5 = x + 12
3x - x = 12 - 6 - 5
2x = 1
x = 1/2