Question

[163×7-438:3+(4+x:9)]:100+2345:35=77
2899+[3×(125+548:x)+3]-545×2=3009

Answer 1

a) [1141-146+(4+x:9)]:100+67=77

[995+(4+x:9)]:100=77-67

[995+(4+x:9)]:100=10

[995+(4+x:9)]=10*100

995+(4+x:9)=10000

4+x:9=10000-995

4+x:9=9005

x:9=9005-4

x:9=9001

x=9001*9

x=81009

b) 2899+[3*(125+548:x)+3]-1090=3009

2899+[3*(125+548:x)+3]=3009+1090

2899+[3*(125+548:x)+3]=4099

3*(125+548:x)+3=4099-2899

3*(125+548:x)+3=1200

3*(125+548:x)=1200-3

3*(125+548:x)=1197

125+548:x=1197:3

125+548:x=399

548:x=399-125

548:x=274

x=548:274

x=2

Answer 2

[163×7-438:3+(4+x:9)]:100+2345:35=77
[1141-146+(4+x:9)]:100+67=77
[995+(4+x:9)]:100=77-67
[995+(4+x:9)]:100=10
995+(4+x:9)=10×100
995+(4+x:9)=1000
4+x:9=1000-995
4+x:9=5
x:9=5-4
x:9=1
x=1×9
x=9



2899+[3×(125+548:x)+3]-545×2=3009
2899+[3×(125+548:x)+3]-1090=3009
2899+[3×(125+548:x)+3]=3009+1090
2899+[3×(125+548:x)+3]=4099
3×(125+548:x)+3=4099-2899
3×(125+548:x)+3=1200
3×(125+548:x)=1200-3
3×(125+548:x)=1197
125+548:x=1197:3
125+548:x=399
548:x=399-125
548:x=274
x=548:274
x=2