Why do you think that planting new trees and plants is an important part of fighting against deforestation ?

it is not because trees do not grow fast enough

try using substitution:

x + y - 6 = x - y. (i'm not giving you the exact answer). since 0 = x - y, then sub 0 in the equation with x - y. combine your like terms, and then use inverse operations, and you'll have your answer.

: -)

i think that c)gold was found there

but i am not sure