Question

Resolva as equações

a)3(2-3x) = 7 - 8x

b)(x - 2)(2x + 1) - x = 1 - 2 x ( 2-x)

c)x/3 + 1 = x

Answer 1

a)3(2-3x) = 7 - 8x ==> 6-9x = 7 - 8x=> -8x+9x=6-7=> =>x = -1
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b)(x - 2)(2x + 1) - x = 1 - 2 x ( 2-x)
  
2x^2 + x - 4x - 2 - x = 1 - 4x + 2x^2 =>2x^2 -2x^2-4x+x-x+4x = 1+2

=> 0x = 3   indeterminado
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c) x + 1 = x => x + 3 = 3x => 3x-x = 1 ==> 2x = 1 ==> x = 1/2
    3
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