помогите решить уравнение 5y+7(3-y)=3(5-2y)-6

<span>5y+7(3-y)=3(5-2y)-6</span>

<span>5y+21-7y=15-6y-6</span>

<span>5y-7y+6y=21+6</span>

<span>4y=27</span>

<span>y=27/4</span>

<span>y=6.75</span>

5у+21-7у=15-6у-6

21-2у=9-6у

21+4у=9

4у=-12

у=-3