Question

1))) 4 . (x) = 36
2))) -5 - (-4 + 7 + x) =20 - 35 - 20
3))) 9 . (10 - x +3) = 90 -45 + 27
4))) -126 - 42 - 105= x . (6+2+5)

Answer 1

Respuesta:

1) $x=9$

2)  $x=27$

3)  $x=5$

4)  $x=-21$

Explicación paso a paso:

1)Procedimiento:

$4\left(x\right)=36\\\\\frac{4x}{4}=\frac{36}{4}\\\\x=9$

2)Procedimiento:

$-5-\left(-4+7+x\right)=20-35-20\\\\-4+7=3\\\\-5-\left(x+3\right)=20-35-20\\\\20-35-20=-35\\\\-5-\left(x+3\right)=-35\\\\-5-\left(x+3\right)+5=-35+5\\\\-\left(x+3\right)=-30\\\\\frac{-\left(x+3\right)}{-1}=\frac{-30}{-1}\\\\x+3=30\\\\x+3-3=30-3\\\\x=27$

3)Procedimiento:

$9\left(10-x+3\right)=90-45+27\\\\90-45+27=72\\\\9\left(10-x+3\right)=72\\\\\frac{9\left(10-x+3\right)}{9}=\frac{72}{9}\\\\-x+13=8\\\\-x+13-13=8-13\\\\-x=-5\\\\\frac{-x}{-1}=\frac{-5}{-1}\\\\x=5$

4)Procedimiento:

$-126-42-105=x\left(6+2+5\right)\\\\x\left(6+2+5\right)=-126-42-105\\\\-126-42-105=-273\\\\x\left(6+2+5\right)=-273\\\\\frac{x\left(6+2+5\right)}{13}=\frac{-273}{13}\\\\x=-21$