How to Calculate M in a Simple Math Equation

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Please break down how this solution was reached for me.

-3.2=-M(5)e^-((0.025)(.8))[377cos(377*0.08)-(0.025)sin(377*0.8)]
M=1.73

Thank you soo much!
 
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Calculate e^-((0.025)(.8))[377cos(377*0.08)-(0.025)sin(377*0.8)] first.

then just divide by that answer and then divide by 5.
 
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