-2.5x = 10

x=-4

7x-4.5x=2.5*3-5

2.5x=7.5-5

2.5 times =2.5 times

x= 1

x/2+3x/2=7

2x=7

x=7/2

13x- 15x+x=3

-2x+x =3

-x =3

x=-3

2.5y+ 10y-6y = 15-2 1.5

12.5y-6y=-6.5

6.5y=-6.5

y=- 1

The process is very detailed, and every step is written out. If you have any questions in the future, please come to me.