Question

x+(x+10)+4/5(2x+10)=90

Answer 1

х+(x+10)+4/5(2x+10)=90
х+х+10+1,6х+8=90
3,6х=90-10-8
3,6х=72
х=72:3,6
х= 20

Answer 2

х+(x+10)+4/5(2x+10)=90
х+х+10+1,6х+8=90
х+х+1,6х=90-10-8
3,6х=90-10-8
3,6х=72
х=72:3,6
х= 20