-3/7(y-21)-1/14y

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Solution for -3/7(y-21)-1/14y equation: 


y in (-oo:+oo)

(-3/7)*(y-21)-((1/14)*y) = 0

(-3/7)*(y-21)+(-1/14)*y = 0

-3/7*(y-21)-y/14 = 0

(-3/7*14*(y-21))/14-y/14 = 0

-3/7*14*(y-21)-y = 0

126-7*y = 0

(126-7*y)/14 = 0

(126-7*y)/14 = 0 // * 14

126-7*y = 0

126-7*y = 0 // - 126

-7*y = -126 // : -7

y = -126/(-7)

y = 18

y = 18

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