初一数学化简求值2m-{n=[4m-3(m=2n)]}-5n

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初一数学化简求值2m-{n=[4m-3(m=2n)]}-5n
初一数学化简求值2m-{n=[4m-3(m=2n)]}-5n

初一数学化简求值2m-{n=[4m-3(m=2n)]}-5n
2m-{n+[4m-3(m+2n)]}-5n
=2m-n-[4m-3(m+2n)]-5n
=2m-n-4m+3(m+2n)-5n
=2m-n-4m+3m+6n-5n
=m

里面怎么这么多“=”啊