Question

determine o falo da incognita:
a)2x=16
b)x=-5
  2
c)2x+14=5x-1
d)4x-5=6x+11
e)5z+4-2x=26-3x

Answer 1

a)
$2x = 16 \\ \\ x = \frac{16}{2} \\ \\ x = 8$

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b)
$\frac{x}{2} = -5 \\ \\ \frac{x}{2}+ 5 = 0 \\ \\ \frac{x + 10}{2} \\ \\ x + 10 = 0 \\ \\ x = -10$
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c)
$2x+14=5x-1 \\ \\ 2x - 5x = -1 - 14 \\ \\ 3x = -15 \\ \\ x = \frac{-15}{3} \\ \\ x = -5$
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d)
$4x-5=6x+11 \\ \\ 4x - 6x = 11 + 5 \\ \\ -2x = 16 *(-1) \\ \\ 2x = -16 \\ \\ x = \frac{-16}{2} \\ \\ x = -8$
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e)
$5x+4-2x=26-3x \\ \\ 5x - 2x + 3x = 26 -4 \\ \\ 6x = 22 \\ \\ x = \frac{22}{6} \\ \\ x = \frac{11}{3}$