Question

rezolvati in multimea R ecuatia​
plz ajutor va rog repede

Answer 1

a) 5x+4=25-2x

5x+2x=25-4

7x=21

x=21:7

x=3

S={3}

b)2z-4=8-z

2z+z=8+4

3z=12

z=12:3

z=4

S{4}

c) 6,5y-15=4y+3,4

6,5y-4y=3,4+15

2,5y=18,4

y=18,4:2,5

y=7,36

S={7.36}

coroana?