(1)/(7)(21y+21)-7=-(1)/(5)(5y-20)

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Solution for (1)/(7)(21y+21)-7=-(1)/(5)(5y-20) equation: 


y in (-oo:+oo)

(1/7)*(21*y+21)-7 = -((1/5)*(5*y-20)) // + (1/5)*(5*y-20)

(1/7)*(21*y+21)+(1/5)*(5*y-20)-7 = 0

1/7*(21*y+21)+1/5*(5*y-20)-7 = 0

1/7*(21*y+21)+1/5*(5*y-20)-7 = 0

4*y-7-1 = 0

4*y-8 = 0

4*y-8 = 0

4*y-8 = 0 // + 8

4*y = 8 // : 4

y = 8/4

y = 2

y = 2

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