Question

Resolva as equações:

a) x – 3 = 19 b) x + 7 = 10


c) 2.x – 4 = 12 d) -10 + 2.x = 40

Answer 1

a)

$x - 3 = 19 \\ x = 19 + 3 \\ x = 22$

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b)

$x + 7 = 10 \\ x = 10 - 7 \\ x = 3$

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c)

$2.x - 4 = 12 \\ 2x = 12 + 4 \\ 2x = 16 \\ x = \frac{16}{2} \\ x = 8$

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d)

$- 10 + 2.x = 40 \\ 2x = 40 + 10 \\ 2x = 50 \\ x = \frac{50}{2} \\ x = 25$