Question

Rezolvati ecuatiile:

a) 425+x=146+94x
b) 12x-23=121=
c) 75x=248+74x
d) 0,3x-2,5=0,1x+2,5

Answer 1

a) 425+x=146+94x

425-146=94x-x

279=93x

x=279/93=3

b) 12x-23=121

12x=121+23

12x=144

x=144/12=12

 c) 75x=248+74x

248=75x-74x

x=248
 d) 0,3x-2,5=0,1x+2,5

0,3x-0,1x=2,5+2,5

0,2x=5

x=5/0,2=25

Answer 2

$\displaystyle a).425+x=146+94x \\ x-94x=146-425 \\ -93x=-279 \\ x= \frac{-279}{-93} \\ x=3 \\ b).12x-23=121 \\ 12x=121+23 \\ 12x=144 \\ x= \frac{144}{12} \\ x=12$
$\displaystyle c).75x=248+74x \\ 75x-74x=248 \\ x=248 \\ d).0,3x-2,5=0,1x+2,5 \\ 0,3x-0,1x=2,5+2,5 \\ 0,2x=5 \\ x= \frac{5}{0,2} \\ x=25$