3x/21(x+y)

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Solution for 3x/21(x+y) equation: 


x in (-oo:+oo)

((3*x)/21)*(x+y) = 0

1/7*x*(x+y) = 0

( 1/7*x )

1/7*x = 0 // : 1/7

x = 0

( x+y )

x+y = 0 // - y

x = -y

x in { 0, -y }

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