Question

Encontre o valor do x
a) 2x - 7 = 12 + x
b) 15x + 23 = -5x - 17
c) 7x + 18 = 16 + 4x
d) 12- 5x = 20 + 2x
e) 11x + 28 = 21 + 7x
f) -9 - x = -22 - 3x

Answer 1

Resposta:

A)

$x = 19$

B)

$x = - 2$

C)

$x = \frac{32}{3}$

D)

$x = - \frac{8}{7}$

E)

$x = - \frac{7}{64}$

F)

$x = \frac{13}{2}$

Explicação passo-a-passo:

Espero ter ajudado!

Answer 2

Resposta:

$a)\\ 2x-7=12+x\\ \\ 2x-x=12+7\\ \\ x=19$

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$b)\\ 15x+23=-5x-17\\ \\ 15x+5x=-17-23\\ \\ 20x=-40\\ \\ x=-{40\over20}\\ \\ x=-2$

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$c)\\ 7x+18=16+4x\\ \\ 7x-4x=16-18\\ \\ 3x=-2\\ \\ x=-{2\over3}$

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$d)\\ 12-5x=20+2x\\ \\ -5x-2x=20-12\\ \\ -7x=8~~~\times(-1)\\ \\ 7x=-8\\ \\ x=-{8\over7}$

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$e)\\ 11x+28=21+7x\\ \\ 11x-7x=21-28\\ \\ 4x=-7\\ \\ x=-{7\over4}$

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$f)\\ -9-x=-22-3x\\ \\ -x+3x=-22+9\\ \\ 2x=-13\\ \\ x=-{13\over2}$