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[(a×3+400)-100]:5=6900

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[(a×3+400)-100]:5=6900
[(3a+400)-100]:5=6900
(3a+400)-100=6900×5
(3a+400)-100=34500
3a+400=34500+100
3a+400=34600
3a=34600-400
3a=34200
a=34200:3
a=11400
[(a×3+400)-100]:5=6900
[(a×3+400)-100]=6900x5
(a×3+400)-100=34500
ax3+400-100=34500
ax3+300=34500
ax3=34500-300
ax3=34200
a=34200:3
a=11400

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