Question

a) 2x+40=3x-20
b) 7x-20=3x+40
c) 4x-30=x+20
d) x+45=2.x
​

Answer 1

Respuesta:

a.

$2x + 40 = 3x - 20 \\ 2x - 3x = - 20 - 40 \\ - 1x = - 60 \\ x = - 60 \div ( - 1) \\ x = 60$

b.

$7x - 20 = 3x + 40 \\ 7x - 3x = 40 + 20 \\ 4x = 60 \\ x = 60 \div 4 \\ x = 15$

c.

$4x - 30= x + 20 \\ 4x - x = 20 + 30 \\ 3x = 50 \\ x = 50 \div 3 \\ x = 16.67$

d.

$x + 45 = 2x \\ 45 = 2x - x \\ 45 = x$