2y/3-y/3=21/3

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Solution for 2y/3-y/3=21/3 equation: 


y in (-oo:+oo)

(2*y)/3-(y/3) = 21/3 // - 21/3

(2*y)/3-(y/3)-(21/3) = 0

(2*y)/3-(y/3)-7 = 0

1/3*y-7 = 0 // + 7

1/3*y = 7 // : 1/3

y = 7/1/3

y = 21

y = 21

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