-4
Пошаговое объяснение:
(2-7y)/6 + (4y+7)/3 = -y/2 |×6
6*(2-7y)/6 + 6*(4y+7)/3 =6*( -y/2)
(2-7y)(6/6) + (4y+7)(2*3/3) = -y*(3*2/2)
(2-7y)*1 + (4y+7)*2 = -y*3
2*1-7y*1+(4y)*2+7*2=-3*y
2-7y+8y+14=-3y
-7y+8y+3y=-14-2
4y=-16
y=-16:4
y=-4
проверка:
-4
Пошаговое объяснение:
(2-7y)/6 + (4y+7)/3 = -y/2 |×6
6*(2-7y)/6 + 6*(4y+7)/3 =6*( -y/2)
(2-7y)(6/6) + (4y+7)(2*3/3) = -y*(3*2/2)
(2-7y)*1 + (4y+7)*2 = -y*3
2*1-7y*1+(4y)*2+7*2=-3*y
2-7y+8y+14=-3y
-7y+8y+3y=-14-2
4y=-16
y=-16:4
y=-4
проверка:
(2-7*(-4))/6=(2+28)/6=30/6=5(4*(-4)+7)/3=(-16+7)/3=-9/3=-3-(-4)/2=4/2=25+(-3)=5-3=2—верно