M-21.5=b+3.9

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Solution for M-21.5=b+3.9 equation: 



-21.5=M+3.9

We move all terms to the left:

-21.5-(M+3.9)=0

We get rid of parentheses

-M-3.9-21.5=0

We add all the numbers together, and all the variables

-1M-25.4=0

We move all terms containing M to the left, all other terms to the right

-M=25.4

M=25.4/-1

M=-25+0.4/1

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