Question

3×-(2×-1)=7×-(3-5×)+(-×+21) ​

Answer 1

Respuesta:

3×-(2×-1)=7×-(3-5×)+(-×+21)

3x-2x+1=7x-3+5x-x+21

3x-2x-7x-5x+x=-3+21-1

4x-14x=+21-4

-10x=+17

x=+17/-10

x=-1,7

Answer 2

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$\mathrm{Problema}$

$3x-(2×-1)=7x-(3-5x)+(-x+21)$

$\mathrm{Respuesta}$

$x = - \frac{17}{10}$

Explicación paso a paso:

$\mathrm{Solución}$

$3x - 2x + 1 = 7x - (3 - 5x) + ( - x + 21)$

$\\ 3x - 2x + 1 = 7x - 3 + 5x + ( - x + 21)$

$3x - 2x + 1 = 7x - 3 + 5x - x + 21 \\ \\ x + 1 = 7x - 3 + 5x - x + 21 \\ \\ x + 1 = 11x - 3 + 21 \\ \\ x + 1 = 11x + 18 \\ \\ x + 1 - 11x = 18 \\ \\ x - 11x = 18 - 1 \\ \\ - 10x = 18 - 1 \\ \\ - 10x = 17 \\ \\ x = - \frac{17}{10}$

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