Question

Rezolvati ecuatiile :

a) 5+20x=20+10x
b) 2x+90=4x
c)3,5x=120-2,5x

Answer 1

a) ... 20x-10x=20-5   adica 10x=15  deci  x=15/10=1,5 ;
b) ... 90=4x-2x adica 90=2x deci x=90/2=45 ;
c) ... 3,5x+2,5x = 120 adica 6x = 120 deci x=2o ;