Question

Okay so,am just confused with my answer so cam someone plz do the sum for me plzzzzzzzzzzzzz............don't do no.6, and yeah the steps on the right side is a part of question no.5

Answer 1

look in step two....
we have to substitute the value of X from step 1 but we are substituting value of -x....
means
we are writing.
3(-4y-9)-2y=7(wrong)
in place of
3(4y+9)-2y=7(right)...
mark as brainliest if helped