Question

A) 2• - 8 = 14

B) 5 • + 12 = 3 • 8

C) - 16 + 10 • = 6 • + 20

D) 4 ( • + 5) = 2 • - 8

E) 6 • - 3 ( • + 4) = 12

F) 10• - 5 ( • + 2) = 20

Answer 1

• = x

A) 2x - 8 = 14
2x = 22
x = 11
S= {11}

B) 5x + 12 = 3x - 8
2x = -20
x = -10
S= {-10}

C) -16 + 10x = 6x +20
-36 = -4x * (-1)
4x = 36
x = 9
S= {9}

D) 4 * ( x+5) = 2x - 8
4x + 20 = 2x - 8
2x = -28
x = -14
S= {-14}

E) 6x - 3 (x+4) = 12
6x - 3x - 12 = 12
3x = 24
x = 8
S= {8}

F) 10x - 5 (x+2) = 20
10x - 5x - 10 = 20
5x = 30
x = 6
S= {6}

Bons estudos! :)