Question

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

Answer 1

a)5+20=20x-10
25=10x
x=25 supra 10=2,5

b)90=2x+4x
90=6x
x=90 supra 6=15

c)120=3,5x-2,5x
120=1x
x=120

Answer 2

a. 20=10x+5+20x
⇒20=30x+5
⇒30x=20-5=15⇒x=15/30=1/2;
b. 2x=90⇒x=45;
c. 120=6x⇒x=20;