Larry C. answered • 02/22/18

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-13=5(1+4m)-2m can be simplified by multiplying and then combining terms:

-13=5+20m-2m

-13=5+2m Now that it's simplified, get all the constant values on one side of the equality and solve for m

-13 - 5 = 5 - 5 +2m

-18 = 2m

-9 = m