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-20 = -4n - n

Need help with math homework. It's about solving multi step equations.
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1 Answer

multiply both sides by -1
 
that gives you 20 = 4n + n
 
add 4n and n
 
 that is 5n so you have 20 = 5n
 
divide both sides by 5
 
that gives you 4 = n    that is the solution