J/2-7=9

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Solution for J/2-7=9 equation: 


J in (-oo:+oo)

J/2-7 = 9 // - 9

J/2-9-7 = 0

1/2*J-16 = 0 // + 16

1/2*J = 16 // : 1/2

J = 16/1/2

J = 32

J = 32

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