Question

найдите корень уровнения

Answer 1

3)
2-7y+2(4y+7)=3*(-y)
2-7y+8y+14=-3y
y+16=-3y
y+3y=-16
4y=-16
y=-16:4
y=-4

4)
7y-1-3*(y+1)=4*(2y+5)
7y-1-3y-3=8y+20
4y-4=8y+20
8y-4y=-4-20
4y=-24
y=-24:4
y=-6