Răspuns :
{[(x+15)x10]-100}:5+90=100
{[(x+15)x10]-100}:5=100-90
{[(x+15)x10]-100}:5=10
{[(x+15)x10]-100}=10x5
[(x+15)x10]-100=50
[(x+15)x10]=50+100
[(x+15)x10]=150
(x+15)=150:10
x+15=15
x=15-15
x=0
{[(x+15)x10]-100}:5=100-90
{[(x+15)x10]-100}:5=10
{[(x+15)x10]-100}=10x5
[(x+15)x10]-100=50
[(x+15)x10]=50+100
[(x+15)x10]=150
(x+15)=150:10
x+15=15
x=15-15
x=0
{[(x+15 )×10 ]-100 }:5 + 90 = 100
{[(x+15 )×10 ]-100 }:5 = 100-90
{[(x+15)×10 ]-100 }:5 = 10
{[(x+15 )×10 ]-100}=10×5
{[(x+15 )×10 ]-100 =50
[(x+15)×10 ]=50 +100
(x+15)×10 = 150
x+15 = 150:10
x+15 = 15
x=15 -15
x=0
{[(x+15 )×10 ]-100 }:5 = 100-90
{[(x+15)×10 ]-100 }:5 = 10
{[(x+15 )×10 ]-100}=10×5
{[(x+15 )×10 ]-100 =50
[(x+15)×10 ]=50 +100
(x+15)×10 = 150
x+15 = 150:10
x+15 = 15
x=15 -15
x=0