Question

equações de 1 grau

a) 3 (x + 2) = 2 (x - 7)

b) 3 (x + 2) -2 (x + 3) + 6 = 0

c) x - 1 = 7 - 2x

Answer 1

a) 3(x + 2) = 2(x - 7)

3x + 6 = 2x - 14

3x - 2x = -14 - 6

x = -20

b) 3(x + 2) - 2(x + 3) + 6 = 0

3x + 6 - 2x - 6 + 6 = 0

x + 6 = 0

x = -6

c) x - 1 = 7 - 2x

x + 2x = 7 + 1

3x = 8

x = 8/3