-10(-4x+10)=-300
-40x-100=-300
-40x=-200
X=5
-10a+108=-64a
-10a+64a=-108
54a=-108
a=-2
26-5m=2-9m
-5m+9m=2-26
4m=-24
m=-6
-y+20=+y
-y-y=-20
-y^2=-20
y^2=20
y=2корень из 5
y=
