Question

a) x+9=13 b)x-7=10 c)5x-1=9 d)x-=8

Answer 1

Resolução!

A )


x + 9 = 13


x = 13 - 9


x = 4

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B )


x - 7 = 10

x = 10 + 7

x = 17

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C )


5x - 1 = 9

5x = 9 + 1

x = 10/5

x = 2

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D )


- x = 8 * (-1)

x = - 8