Question

(x+500)+2.(x+500)=7800

Answer 1

(x+500)+2(x+500)=7800
x+500+2x+1000=7800
x+2x=7800-500-1000
3x=6300
x=6300/3
x=2100

Answer 2

(x+500)+2.(x+500)=7800

x+500+2(x+500)=7800

x+500+2+1000=7800

3x=7800-1500

3x=6300

x = 6300/3

x = 2100