Question

a) - 3 (3x - 42 ) = 2 ( 7x - 52)
b)
X 1-X_1
2 5 2
3+X
c)
x + 3
d)
+
X + 2 -1
3 2
2
2
(1-x) = ***
2(x - 1), 3(1+x). 1 x-1
+
e)
2X-4 X-5
3x -1 4x + 2
2
4
=
3
2
2
3
3
6​

Answer 1

Resposta:

A: -3(3x-42)=2(7x-52)

(-3.3x) (-3.-42)= (2.7x) (2.-52)

-9x+126= 7x-104

-9x-7x= -104-216

-16x= -320(-1)

16x=320

x=320÷16

x=20

B:

$\frac{x}{2} + \frac{1 - x}{5} = \frac{1}{2} \\ \frac{5x}{10} + \frac{2 - 2x}{10} = \frac{5}{10} \\ 5x + 2 - 2x = 5 \\ 5x - 2x = 5 - 2 \\ 3x = 3 \\ x = 3 \div 3 \\ x = 1$

C: X+3=0

X=-3