Решите уравнения 5(y+1,2)=7y+4 4(x-3)-16=5(x-5) 3x-17=8x+18 11-5y=12-6y 4y+(11,8-y)=3,8-5y 3x+16=8x-9

Решу по одному.

1. $5(y+1{,}2)=7y+4$
   $5y+6=7y+4$ → $5y-7y=4-6$ → $-2y=-2$ → $y=1$.

2. $4(x-3)-16=5(x-5)$
   $4x-12-16=5x-25$ → $4x-28=5x-25$ → $-28=-25+x$ → $x=-3$.

3. $3x-17=8x+18$
   $-17-18=8x-3x$ → $-35=5x$ → $x=-7$.

4. $11-5y=12-6y$
   Добавим $6y$: $11+y=12$ → $y=1$.

5. $4y+(11{,}8-y)=3{,}8-5y$
   $4y+11{,}8-y=3{,}8-5y$ → $3y+11{,}8=3{,}8-5y$ → $3y+5y=3{,}8-11{,}8$ → $8y=-8$ → $y=-1$.

6. $3x+16=8x-9$
   $16+9=8x-3x$ → $25=5x$ → $x=5$.

Ответы:

1. $y=1$; 2) $x=-3$; 3) $x=-7$; 4) $y=1$; 5) $y=-1$; 6) $x=5$.