3y--7y=
\(3y--7y=\)
\(3y-(-7y)=\)
\(3y-(-7y)\)
\(3y+7y\)
\(10y\)
\(3y-7y=-4y \) !
maybe you have old eyes like I do asinus :)
there are 2 minus signs - -
You're soo right, Melody!There are two minus signs.
!
