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(1) M+B=2*J

(2) M=8+B

(3) J+B=20

Three equations. Three unknowns.

Rewrite (1)

M=2*J-B

Sub into (2)

2*J-B=8+B

Solve for B

2B+8=2J or B+4=J

Sub J into (3)

2B + 4 = 20

B = 8

J = 12

M=16

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