Question

calculati ecuatiile: 404-x pe9=20,65;  4+2x=1;  5x-23=3x+7.
 
va rog foarte mult!!!!

Answer 1

4+2x=1⇒2x=1-4⇒x=$\frac{-3}{2}$
5x-23=3x+7⇔2x=30⇒x=15

Answer 2

404-x=9*20
-x=180-404
x=224
2x=-3
x=-3 pe 2
5x-3x=7+23
2x=30
x=15