(x-0.2x)+(x+150)-0.1(x+150)=645
x – 0.2x + x + 150 – 0.1x – 15 = 645
x – 0,2x + x – 0,1x = 645 + 15 – 150
1.7x = 510
x = 300
(x-0.2x)+(x+150)-0.1(x+150)=645
x – 0.2x + x + 150 – 0.1x – 15 = 645
x – 0,2x + x – 0,1x = 645 + 15 – 150
1.7x = 510
x = 300