15 (х-2)=7(х-2)+16

3(5+2х)+4х=1455

3х-8=5х

5 (х+2)=9 (х-2)+16

15(x-2)=7(x-2)+16

15x-30=7x-14+16

8x-30=-14+16

8x=30-14+16

8x=32

x=4

3(5+2x)+4x=1455

15+6x+4x=1455

15+10x=1455

10x=1455-15

10x=1440

x=144

3x-8=5x

3x-5x=8

-2x=8

x=-4

5(x+2)=9(x-2)+16

5x+10=9x-18+16

5x-9x=16-18-10

-4x=-12

x=3