1/2(20M+40)+1/2M

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Solution for 1/2(20M+40)+1/2M equation: 


M in (-oo:+oo)

(1/2)*(20*M+40)+(1/2)*M = 0

1/2*(20*M+40)+M/2 = 0

(1/2*2*(20*M+40))/2+M/2 = 0

1/2*2*(20*M+40)+M = 0

21*M+40 = 0

(21*M+40)/2 = 0

(21*M+40)/2 = 0 // * 2

21*M+40 = 0

21*M+40 = 0 // - 40

21*M = -40 // : 21

M = -40/21

M = -40/21

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