Question

WHAT IS 7-Y-Y=-1

Answer 1

you need to simplify. -1y-1y is -2y, so
\[7-2y=-1\]
move the 7 to the other side
\[7-7-2y=-1-7\]
then get rid of the -2
\[(-2y)/-2 = -8/-2\]
and your answer is
\[y=4\]