3(7-z)/2=-z

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Solution for 3(7-z)/2=-z equation: 


z in (-oo:+oo)

(3*(7-z))/2 = -z // + z

(3*(7-z))/2+z = 0

(3*(7-z))/2+(2*z)/2 = 0

3*(7-z)+2*z = 0

21-z = 0

(21-z)/2 = 0

(21-z)/2 = 0 // * 2

21-z = 0

21-z = 0 // - 21

-z = -21 // * -1

z = 21

z = 21

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